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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Psychiatry</journal-id>
<journal-title>Frontiers in Psychiatry</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Psychiatry</abbrev-journal-title>
<issn pub-type="epub">1664-0640</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fpsyt.2023.1242611</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Psychiatry</subject>
<subj-group>
<subject>Original Research</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Association between behavioral patterns and depression symptoms: dyadic interaction between couples</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name><surname>Yang</surname> <given-names>Qianhui</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
</contrib>
<contrib contrib-type="author">
<name><surname>Gao</surname> <given-names>Xin</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
</contrib>
<contrib contrib-type="author">
<name><surname>Tang</surname> <given-names>Ying</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
</contrib>
<contrib contrib-type="author">
<name><surname>Gan</surname> <given-names>Hong</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
</contrib>
<contrib contrib-type="author">
<name><surname>Wang</surname> <given-names>Baoling</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
</contrib>
<contrib contrib-type="author">
<name><surname>Li</surname> <given-names>Mengdie</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
</contrib>
<contrib contrib-type="author">
<name><surname>Pan</surname> <given-names>Guixia</given-names></name>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
<xref ref-type="aff" rid="aff5"><sup>5</sup></xref>
<uri xlink:href="http://loop.frontiersin.org/people/1606248/overview"/>
</contrib>
<contrib contrib-type="author">
<name><surname>Bao</surname> <given-names>Shuangshuang</given-names></name>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
</contrib>
<contrib contrib-type="author">
<name><surname>Zhu</surname> <given-names>Peng</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
<uri xlink:href="http://loop.frontiersin.org/people/1629520/overview"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name><surname>Shao</surname> <given-names>Shanshan</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
<xref ref-type="corresp" rid="c002"><sup>&#x002A;</sup></xref>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name><surname>Tao</surname> <given-names>Fangbiao</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="aff" rid="aff4"><sup>4</sup></xref>
<xref ref-type="corresp" rid="c001"><sup>&#x002A;</sup></xref>
<uri xlink:href="http://loop.frontiersin.org/people/572867/overview"/>
</contrib>
</contrib-group>
<aff id="aff1"><sup>1</sup><institution>Department of Maternal, Child and Adolescent Health, School of Public Health, Anhui Medical University, Hefei</institution>, <addr-line>Anhui</addr-line>, <country>China</country></aff>
<aff id="aff2"><sup>2</sup><institution>MOE Key Laboratory of Population Health Across Life Cycle, Hefei</institution>, <addr-line>Anhui</addr-line>, <country>China</country></aff>
<aff id="aff3"><sup>3</sup><institution>NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Hefei</institution>, <addr-line>Anhui</addr-line>, <country>China</country></aff>
<aff id="aff4"><sup>4</sup><institution>Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei</institution>, <addr-line>Anhui</addr-line>, <country>China</country></aff>
<aff id="aff5"><sup>5</sup><institution>Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei</institution>, <addr-line>Anhui</addr-line>, <country>China</country></aff>
<author-notes>
<fn fn-type="edited-by"><p>Edited by: Ada W. T. Fung, Hong Kong Baptist University, Hong Kong SAR, China</p></fn>
<fn fn-type="edited-by"><p>Reviewed by: Giulia Ferraris, European Institute of Oncology (IEO), Italy; Serena Sabatini, University of Nottingham, United Kingdom</p></fn>
<corresp id="c001">&#x002A;Correspondence: Fangbiao Tao, <email>taofangbiao@126.com</email></corresp>
<corresp id="c002">Shanshan Shao, <email>2016500013@ahmu.edu.cn</email></corresp>
</author-notes>
<pub-date pub-type="epub">
<day>16</day>
<month>11</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="collection">
<year>2023</year>
</pub-date>
<volume>14</volume>
<elocation-id>1242611</elocation-id>
<history>
<date date-type="received">
<day>19</day>
<month>06</month>
<year>2023</year>
</date>
<date date-type="accepted">
<day>30</day>
<month>10</month>
<year>2023</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#x00A9; 2023 Yang, Gao, Tang, Gan, Wang, Li, Pan, Bao, Zhu, Shao and Tao.</copyright-statement>
<copyright-year>2023</copyright-year>
<copyright-holder>Yang, Gao, Tang, Gan, Wang, Li, Pan, Bao, Zhu, Shao and Tao</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/"><p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p></license>
</permissions>
<abstract>
<sec>
<title>Background</title>
<p>Behavioral patterns are sometimes associated with depression symptoms; however, few studies have considered the intra-couple effects. This study examined the effect of a spouses&#x2019; behavioral patterns on depression symptoms within themself and in their spouse.</p>
</sec>
<sec>
<title>Methods</title>
<p>A total of 61,118 childbearing age participants (30,559 husband-wife dyads) were surveyed. The depression symptoms were assessed using the nine-item Patient Health Questionnaire (PHQ-9). The behavioral patterns were identified by the latent class analysis. The effects of behavioral patterns on the couple&#x2019;s own depression symptoms (actor effect) and their partner&#x2019;s depression symptoms (partner effect) were analyzed using the Actor-Partner Interdependence Model (APIM).</p>
</sec>
<sec>
<title>Results</title>
<p>Three behavioral patterns were identified: low-risk group, moderate-risk group, and high-risk group. The high risk of these behavior patterns would be associated with a higher score on the PHQ-9; for both husbands and wives, their behavioral patterns were positively associated with PHQ-9 scores (&#x03B2;<sub>husband</sub> = 0.53, <italic>P</italic> &#x003C; 0.01; &#x03B2;<sub>wife </sub>= 0.58, <italic>P</italic> &#x003C; 0.01). Wives&#x2019; behavioral patterns were also positively associated with their husbands&#x2019; PHQ-9 scores (&#x03B2; = 0.14, <italic>P</italic> &#x003C; 0.01), but husbands&#x2019; behavioral patterns were not associated with their wives&#x2019; PHQ-9 scores.</p>
</sec>
<sec>
<title>Conclusions</title>
<p>Wives&#x2019; depression symptoms were affected only by their own behavioral patterns, whereas husbands&#x2019; depression symptoms were influenced by both their own and their spouses&#x2019; behavioral patterns.</p>
</sec>
</abstract>
<kwd-group>
<kwd>depression symptom</kwd>
<kwd>childbearing age</kwd>
<kwd>dyadic correlation</kwd>
<kwd>health-related behavior</kwd>
<kwd>couple</kwd>
</kwd-group>
<counts>
<fig-count count="3"/>
<table-count count="3"/>
<equation-count count="0"/>
<ref-count count="56"/>
<page-count count="9"/>
<word-count count="6355"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Mood Disorders</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec id="S1" sec-type="intro">
<title>1. Introduction</title>
<p>Depression is a common mental illness that characterized by persistent low mood, diminished interest, and loss of pleasure (<xref ref-type="bibr" rid="B1">1</xref>). In China, the lifetime prevalence rate of depressive disorders had reached 6.9%, according to a recent large-scale survey (<xref ref-type="bibr" rid="B2">2</xref>). Depression in couples often affect marital quality, leading to increased divorce rates and potentially affecting the health of offspring (<xref ref-type="bibr" rid="B3">3</xref>&#x2013;<xref ref-type="bibr" rid="B5">5</xref>). A meta-analysis evaluating five family studies showed a two- to three-fold increase in depression risk in the first-degree offspring of patients with depression (<xref ref-type="bibr" rid="B6">6</xref>). Moreover, the probability of depression is more than five times higher in a population with a depressed spouse than in those without a depressed spouse (<xref ref-type="bibr" rid="B7">7</xref>). Given the burden of depression and the correlation between couples, it is essential to understand the related modifiable risk factors (e.g., health-related behaviors) to design comprehensive and targeted interventions.</p>
<p>Recent data show that health-related behaviors&#x2014;including drinking (<xref ref-type="bibr" rid="B8">8</xref>), smoking (<xref ref-type="bibr" rid="B9">9</xref>), dietary factors (<xref ref-type="bibr" rid="B10">10</xref>), physical inactivity (<xref ref-type="bibr" rid="B11">11</xref>), and sleep (<xref ref-type="bibr" rid="B12">12</xref>)&#x2014;were associated with depressive symptoms. Additionally, these behaviors are codependent and should be considered simultaneously (<xref ref-type="bibr" rid="B13">13</xref>, <xref ref-type="bibr" rid="B14">14</xref>). A cluster analysis study found that, compared with the relatively high-risk class, physically active and nonsmoking-and-nondrinking classes had lower probabilities of depression (<xref ref-type="bibr" rid="B15">15</xref>). However, most existing studies investigated depression and health-related behaviors among married people on individual-level determinants, rather than the couple dyad.</p>
<p>Family system theory states that family members are intensely emotionally connected, and that individuals interact with one another in a family (<xref ref-type="bibr" rid="B16">16</xref>&#x2013;<xref ref-type="bibr" rid="B18">18</xref>). Couples influence each other and share various environmental factors and experiences. Many investigative studies have found that one partner&#x2019;s life satisfaction (<xref ref-type="bibr" rid="B16">16</xref>), marital satisfaction (<xref ref-type="bibr" rid="B17">17</xref>), or physical activity (<xref ref-type="bibr" rid="B11">11</xref>) was associated with her/his spouse&#x2019;s depression, while Donarelli et al. (<xref ref-type="bibr" rid="B19">19</xref>) found that psychological counseling for couples was effective in improving their psychological wellbeing at the dyadic level. However, few studies have focused on the impact of health-related behaviors on depression symptoms at the dyadic level of couples. Given the intrinsically dyadic nature of both the behaviors and the depression symptoms, a dyadic approach should be applied when the study subjects were couples (<xref ref-type="bibr" rid="B20">20</xref>, <xref ref-type="bibr" rid="B21">21</xref>). The Actor-Partner Interdependence Model (APIM) is a statistical approach that can be applied to analyze dyadic interactions (<xref ref-type="bibr" rid="B22">22</xref>). It estimates the effects of an individual&#x2019;s attributes on both their own outcome variable (actor effect) and that of their partner (partner effect). The APIM was recently used to simultaneously examine intra- and interpersonal effects among couples, such as that of marital satisfaction on depression (<xref ref-type="bibr" rid="B23">23</xref>, <xref ref-type="bibr" rid="B24">24</xref>).</p>
<p>This multicenter cross-sectional study used a Latent Class Analysis (LCA) to identify participants&#x2019; behavioral patterns, including various health-related behaviors, and applied the APIM framework to determine actor and partner effects of behavioral patterns on depression symptoms among couples of childbearing age (Women aged 20&#x2013;49 years and men aged 22&#x2013;49 years). We hypothesized that (1) behavioral patterns between couples are correlated, as is depression symptoms between couples; and (2) behavioral patterns would be associated with the individual&#x2019;s own depression symptoms, as well as their spouse&#x2019;s depression symptoms, in husband-wife dyads (see <xref ref-type="fig" rid="F1">Figure 1</xref>).</p>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption><p>Actor&#x2013;Partner Interdependence Model of behavioral patterns and depression. Ah: actor effect of husband&#x2019;s behavioral patterns on his own depression; Aw: actor effect of wife&#x2019;s behavioral patterns on her own depression; Pwh: partner effect of husband&#x2019;s behavioral patterns on wife&#x2019;s depression; Phw: partner effect of wife&#x2019;s behavioral patterns on husband&#x2019;s depression.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpsyt-14-1242611-g001.tif"/>
</fig>
</sec>
<sec id="S2" sec-type="materials|methods">
<title>2. Materials and methods</title>
<sec id="S2.SS1">
<title>2.1. Study population</title>
<p>The <italic>Reproductive Health of Childbearing Couples&#x2014;Anhui Cohort</italic> (RHCC-AC) study is ongoing. RHCC-AC is a large pre-pregnancy cohort study based on reproductive couples. The study aims to identify the independent and combined effects of pre-pregnancy lifestyles and environmental exposure on infertility, adverse pregnancy outcomes, and offspring growth and development. More details are given in our previous literature (<xref ref-type="bibr" rid="B25">25</xref>). We recruited 33,687 couples (33,271 men, 33,354 women, and 32,938 husband-wife dyads) from 16 sites in Anhui Province from April 2019 to June 2021. Women aged 20&#x2013;49 years and men aged 22&#x2013;49 years were eligible. Participants completed a baseline questionnaire regarding demographics, health-related behaviors, reproductive history, and mental health. All questionnaires were completed under the supervision of an investigator. They completed follow-up questionnaires every 6 months for up to 24 months to ascertain their pregnancy status. Informed consent was obtained from all the participants. This study was approved by the Ethics Committee of Anhui Medical University (Number: 20189999).</p>
<p>We excluded 1,319 couples who were included in the pre-survey or where one of the couples did not complete the baseline survey. In addition, we excluded 1,124 remarried couples, as well as 267 couples with missing health-related behavior data, and 418 couples with missing Patient Health Questionnaire (PHQ-9) data. The final data set thus included 30,559 couples (90.7%). A flow diagram of the participants is shown in <xref ref-type="supplementary-material" rid="DS1">Supplementary Figure 1</xref>.</p>
</sec>
<sec id="S2.SS2">
<title>2.2. Measures</title>
<sec id="S2.SS2.SSS1">
<title>2.2.1. Depression symptoms assessment</title>
<p>Depression symptoms was measured using the PHQ-9, a widely used and well-validated patient-rated assessment tool for depressive symptoms (<xref ref-type="bibr" rid="B26">26</xref>, <xref ref-type="bibr" rid="B27">27</xref>). The PHQ-9 comprises nine items to respond to by reviewing the past 2 weeks. Each item is scored on a 4-point scale from 0 (not at all) to 3 (nearly every day). Total scores range from 0 to 27 points, with higher scores indicating more severe depressive symptoms. It has demonstrated considerable reliability and validity, and has been used in numerous studies involving couples of childbearing ages (<xref ref-type="bibr" rid="B28">28</xref>, <xref ref-type="bibr" rid="B29">29</xref>). In this study, the alpha Cronbach of the PHQ-9 was 0.80.</p>
</sec>
<sec id="S2.SS2.SSS2">
<title>2.2.2. Demographic and health-related behaviors information</title>
<p>A self-administered questionnaire was used to collect the demographic and health-related behaviors information. Demographic information included living region, educational level, annual income, age, and BMI. Health-related behaviors included smoking, drinking, chronotype, sitting time, and dietary habits. The different behavioral patterns were determined through latent class analysis (LCA).</p>
<p><italic>Smoking</italic> was assessed&#x2014;and participants classified accordingly&#x2014;by asking &#x201C;Do you smoke?&#x201D; (smoking at least one cigarette per day for 6 months or more).</p>
<p><italic>Drinking</italic> was assessed by asking &#x201C;Have you been drinking in the last 6 months?&#x201D; Possible responses were (1) never, (2) less than once per week, and (3) every week.</p>
<p><italic>Chronotype</italic> was assessed using the Munich Chronotype Questionnaire. Chronotype is an instrument useful for studying circadian biology in humans. It recorded behavior separately, on school (or work) and school-free (or work-free) days. The chronotype was calculated as the midpoint of sleep on school/work-free days, corrected for sleep debt accumulated on school/workdays (<xref ref-type="bibr" rid="B30">30</xref>). The chronotype was expressed as the local clock time and ranged from early (early midpoint of sleep) to late (late midpoint of sleep) chronotypes. Previous studies have found that a late chronotype has been linked to an increased risk for depression, anxiety, and substance abuse among adults (<xref ref-type="bibr" rid="B31">31</xref>). We dichotomized the study population into two groups: early chronotypes and late chronotypes.</p>
<p><italic>Sitting time</italic> was assessed using the International Physical Activity Questionnaires. Participants were asked about the time spent sitting or reclining on a typical day, including at work, at home, getting to and from places, or with friends. We dichotomized the study population into two groups: those sitting for at least 8 h per day (sedentary behavior) and those sitting for less than 8 h per day (<xref ref-type="bibr" rid="B32">32</xref>).</p>
<p><italic>Dietary habits</italic> included the frequency of daily diet and the consumption of takeaway food. The content of daily diet were collected using Food Frequency Questionnaires, including the intake of fruits and vegetables, legumes and nuts, cereals, animal-source foods (eggs, red meat, poultry, aquatic products, milk), sugar-sweetened beverages, and pickled/fired/barbecued foods. For frequency, participants were asked, &#x201C;During the last months, how often did you eat the items listed below?&#x201D; Participants were categorized as &#x201C;daily intake and more&#x201D; and &#x201C;less than daily intake&#x201D; according to their responses on the questionnaires and the Dietary Guidelines for Chinese Residents (2022) (<xref ref-type="bibr" rid="B29">29</xref>). Intake of sugar-sweetened beverages and pickled/fired/barbecued foods were dichotomized into &#x201C;more than three times per week,&#x201D; &#x201C;less than three times per week&#x201D; (<xref ref-type="bibr" rid="B33">33</xref>). Data on takeaway food and disposable cutlery consumption were collected using two questions. &#x201C;How many times did you eat takeaway food in the last week?&#x201D; &#x201C;How many times have you used disposable cutlery in the past week?&#x201D; Consumption was dichotomized into &#x201C;more than three times per week,&#x201D; &#x201C;less than three times per week,&#x201D; as used in a previous study (<xref ref-type="bibr" rid="B29">29</xref>, <xref ref-type="bibr" rid="B33">33</xref>).</p>
</sec>
</sec>
<sec id="S2.SS3">
<title>2.3. Statistical analysis</title>
<p>All analyses were performed using SPSS statistical software (v23.0) and MPLUS statistical software (v8.0). Descriptive statistics&#x2014;such as means, standard deviations, frequencies, and percentages&#x2014;were used to describe participants&#x2019; characteristics. Spearman&#x2019;s correlation analyses were used to determine the correlation between behavioral patterns and depression, behavioral patterns between couples, and depression between couples.</p>
<sec id="S2.SS3.SSS1">
<title>2.3.1. LCA analysis</title>
<p>Latent Class Analysis was used to identify behavioral patterns, a statistical technique for describing unobserved (i.e., latent) subgroups from patterns of observed variables. It considers profile membership as an unobserved categorical variable indicating the probability of an individual belonging to a certain profile (<xref ref-type="bibr" rid="B34">34</xref>). An LCA is suitable for dichotomous variables and also enables the identification of distinct configurations of heterogeneity within a sample. In our study, health-related behaviors were classified as dichotomous variables according to the presence or absence of risk. Specifically, the risk of all health-related behaviors variable was determined using the categories &#x201C;No&#x201D; or &#x201C;Yes&#x201D; for analysis. The assignments and frequency distribution of each indicator are presented in <xref ref-type="supplementary-material" rid="DS1">Supplementary Tables 1, 2</xref>. The best-fitting model was obtained using the Akaike information criterion (AIC), Bayesian information criterion (BIC), and entropy values. The smaller the AIC and BIC values, the simpler the model and the better the fit [<xref ref-type="supplementary-material" rid="DS1">Supplementary Table 3</xref>; (<xref ref-type="bibr" rid="B35">35</xref>)]. Entropy values close to 1.0 indicate a clear delineation of classes, with values &#x003E; 0.8, generally indicating good classification. When more than one model fits well, the best and simplest model is retained, based on parsimony and interpretability.</p>
</sec>
<sec id="S2.SS3.SSS2">
<title>2.3.2. APIM analysis</title>
<p><xref ref-type="fig" rid="F1">Figure 1</xref> depicts the APIM framework of a husband-wife dyad, in which there are two variables from each dyad: behavioral patterns and depression symptoms. This model captures the dependency inherent to couples&#x2019; data. In our study, each spouses&#x2019; outcome (depression symptoms) is made up of a linear combination of his or her score on the independent variable (actor effect) and his or her spouse&#x2019;s score on the same independent variable (partner effect). Specifically, an actor effect is the effect of one&#x2019;s own independent variable on one&#x2019;s own outcome. For example, the effect of husbands&#x2019; behavioral patterns on husbands&#x2019; depression symptoms. A partner effect estimates the association between one&#x2019;s independent variable on one&#x2019;s partner&#x2019;s outcome. For example, the effect of wives&#x2019; behavioral patterns on husbands&#x2019; depression symptoms. Multilevel modeling or structural equation modeling can be used (<xref ref-type="bibr" rid="B36">36</xref>). We chose a distinguishable dyad model that differentiates partners in the dyad, based on certain characteristics; in our case, each couple was treated as a distinct dyadic member, based on gender. The significance level for all analyses was set at 5.0% (<italic>P</italic> &#x003C; 0.05).</p>
</sec>
</sec>
</sec>
<sec id="S3" sec-type="results">
<title>3. Results</title>
<sec id="S3.SS1">
<title>3.1. Characteristics of the study population</title>
<p>Participants&#x2019; demographic characteristics are shown in <xref ref-type="table" rid="T1">Table 1</xref>. The mean and standard deviation (SD) age was 25.77 &#x00B1; 3.35 years for women and 26.83 &#x00B1; 3.31 years for men who were eligible for the study. The mean (SD) BMI was 22.35 ( &#x00B1; 4.48) among wives and 23.7 ( &#x00B1; 3.67) among the husbands. The highest percentage of husbands had college degree or above, at 61.1%, followed by junior high school or below graduates (23.3%), and high school graduates (20.5%). Among wives, 61.1% had college degrees or above, 23.3% had junior high school education or below, and 15.6% had high school education. Compared to wives, husbands had a higher BMI, were less likely to be unemployed in the last month, and earned more per year.</p>
<table-wrap position="float" id="T1">
<label>TABLE 1</label>
<caption><p>Demographics in childbearing age couples (<italic>n</italic> = 30,559).</p></caption>
<table cellspacing="5" cellpadding="5" frame="box" rules="all">
<thead>
<tr>
<td valign="top" align="left" style="color:#ffffff;background-color: #7f8080;">Characteristics</td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;">Wife (<italic>n</italic> = 30,559)</td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;">Husband (<italic>n</italic> = 30,559)</td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;">Total (<italic>n</italic> = 61,118)</td>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Age (years), M (SD)</td>
<td valign="top" align="center">25.77 &#x00B1; 3.35</td>
<td valign="top" align="center">26.83 &#x00B1; 3.31</td>
<td valign="top" align="center">26.30 &#x00B1; 3.37</td>
</tr>
<tr>
<td valign="top" align="left">BMI (kg/m<sup>2</sup>), M (SD)</td>
<td valign="top" align="center">22.35 &#x00B1; 4.48</td>
<td valign="top" align="center">23.74 &#x00B1; 3.67</td>
<td valign="top" align="center">23.05 &#x00B1; 4.15</td>
</tr>
<tr>
<td valign="top" align="left" colspan="4" style="background-color: #dcdcdc;"><bold>Education, n (%)</bold></td>
</tr>
<tr>
<td valign="top" align="left">Junior high school or below</td>
<td valign="top" align="center">7,129 (23.33)</td>
<td valign="top" align="center">7,126 (23.32)</td>
<td valign="top" align="center">14,255 (23.30)</td>
</tr>
<tr>
<td valign="top" align="left">High school</td>
<td valign="top" align="center">4,770 (15.61)</td>
<td valign="top" align="center">6,269 (20.51)</td>
<td valign="top" align="center">11,039 (18.10)</td>
</tr>
<tr>
<td valign="top" align="left">College degree or above</td>
<td valign="top" align="center">18,660 (61.06)</td>
<td valign="top" align="center">17,164 (56.17)</td>
<td valign="top" align="center">35,824 (58.60)</td>
</tr>
<tr>
<td valign="top" align="left" colspan="4" style="background-color: #dcdcdc;"><bold>Annual Income (yuan/years), n (%)</bold></td>
</tr>
<tr>
<td valign="top" align="left">&#x003C;30,000</td>
<td valign="top" align="center">8,976 (29.37)</td>
<td valign="top" align="center">2,166 (7.09)</td>
<td valign="top" align="center">11,142 (18.20)</td>
</tr>
<tr>
<td valign="top" align="left">30,000&#x2013;60,000</td>
<td valign="top" align="center">12,028 (39.36)</td>
<td valign="top" align="center">7,003 (22.92)</td>
<td valign="top" align="center">19,031 (31.10)</td>
</tr>
<tr>
<td valign="top" align="left">&#x003E;60,000</td>
<td valign="top" align="center">9,555 (31.27)</td>
<td valign="top" align="center">21,390 (70)</td>
<td valign="top" align="center">30,945 (50.60)</td>
</tr>
<tr>
<td valign="top" align="left" colspan="4" style="background-color: #dcdcdc;"><bold>Regional areas, n (%)</bold></td>
</tr>
<tr>
<td valign="top" align="left">Central Anhui, China</td>
<td valign="top" align="center">13,547 (44.33)</td>
<td valign="top" align="center">13,547 (44.33)</td>
<td valign="top" align="center">27,094 (44.33)</td>
</tr>
<tr>
<td valign="top" align="left">North Anhui, China</td>
<td valign="top" align="center">7,865 (25.74)</td>
<td valign="top" align="center">7,865 (25.74)</td>
<td valign="top" align="center">15,730 (25.74)</td>
</tr>
<tr>
<td valign="top" align="left">South Anhui, China</td>
<td valign="top" align="center">9,147 (29.93)</td>
<td valign="top" align="center">9,147 (29.93)</td>
<td valign="top" align="center">18,294 (29.93)</td>
</tr>
<tr>
<td valign="top" align="left" colspan="4" style="background-color: #dcdcdc;"><bold>Work, n (%)</bold></td>
</tr>
<tr>
<td valign="top" align="left">Employment</td>
<td valign="top" align="center">24,773 (81.07)</td>
<td valign="top" align="center">29,505 (96.55)</td>
<td valign="top" align="center">54,278 (88.81)</td>
</tr>
<tr>
<td valign="top" align="left">Unemployment</td>
<td valign="top" align="center">5,786 (18.93)</td>
<td valign="top" align="center">1,054 (3.45)</td>
<td valign="top" align="center">6,840 (11.19)</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn><p>SD, standard deviation; BMI, body mass index.</p></fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="S3.SS2">
<title>3.2. Latent classes of health-related behaviors among couples</title>
<p>As shown in <xref ref-type="supplementary-material" rid="DS1">Supplementary Table 3</xref>, the three-class model was the most parsimonious and substantively sound for husbands and wives. For husbands, the three-class model had lower BIC and AIC than the one- and two-class models and higher entropy values than the four- and five-class models. Similarly, the best fit for wives was achieved using the three-class model.</p>
<p><xref ref-type="fig" rid="F2">Figure 2</xref> presents the item-response probabilities of the three LCA groups from the three-class model. For husbands, the green line labeled the low-risk group named basic health patterns (27.0%), representing the relatively low probabilities of unhealthy behaviors; the blue line labeled the moderate-risk group named unhealthy dietary patterns (58.9%), representing those with the highest possibility of low intake of healthy food, such as legumes and nuts (98.0%), animal protein (81.0%), and cereals (84.0%), but the lowest possibility of other risky behaviors; the red line labeled the high-risk group named multi-risk behavior coexists patterns (14.1%), representing those with the high possibility of smoking (56.0%), drinking (70.0%), and evening chronotype (52.0%).</p>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption><p>Groups of clustered risk behaviors among husband-wife dyads. 1, Smoking; 2, Drinking; 3, Chronotype; 4, Sitting time; 5, Pickled/fired/barbecued foods; 6, Sugar-sweetened beverages; 7, Takeaway food; 8, Disposable cutlery; 9, Cereals; 10, Fruits and vegetables; 11, Animal-source foods; 12, Legumes and nuts.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpsyt-14-1242611-g002.tif"/>
</fig>
<p>Among the wives, 30.7% belonged to the low-risk group, 53.0% to the moderate-risk group, and 16.2% to the high-risk group. Specifically, the low-risk group had a relatively positive profile, with low possibility of smoking (2.0%) and low probability of inadequate vegetable and fruit consumption (4.0%). The moderate-risk group had the highest probability of a low intake of legumes and nuts (99.0%), and low intake of cereals (89.0%). The high-risk group showed a high probability of the evening chronotype (51.0%), high intake of takeaway food (84.0%), and high consumption of disposable cutlery (89.0%). For a more detailed probability analysis, refer to <xref ref-type="supplementary-material" rid="DS1">Supplementary Table 4</xref>.</p>
</sec>
<sec id="S3.SS3">
<title>3.3. Correlations between behavioral patterns and depression symptoms in couples</title>
<p>The correlations between the study variables are presented in <xref ref-type="table" rid="T2">Table 2</xref>. Within-dyad correlations revealed that husbands&#x2019; behavioral patterns were significantly related to wives&#x2019; behavioral patterns (<italic>r</italic> = 0.15, <italic>P</italic> &#x003C; 0.01), and husbands&#x2019; PHQ-9 scores were positively correlated with wives&#x2019; PHQ-9 scores (<italic>r</italic> = 0.12, <italic>P</italic> &#x003C; 0.01). Husbands&#x2019; behavioral patterns were correlated with both their own PHQ-9 scores (<italic>r</italic> = 0.11, <italic>P</italic> &#x003C; 0.01) and their wives&#x2019; PHQ-9 scores (<italic>r</italic> = 0.04, <italic>P</italic> &#x003C; 0.01). Wives&#x2019; behavioral patterns were also correlated with both their own (<italic>r</italic> = 0.12, <italic>P</italic> &#x003C; 0.01) and their husbands&#x2019; PHQ-9 scores (<italic>r</italic> = 0.03, <italic>P</italic> &#x003C; 0.01).</p>
<table-wrap position="float" id="T2">
<label>TABLE 2</label>
<caption><p>Correlation between behavioral patterns and depression among childbearing age couples (<italic>n</italic> = 30,559).</p></caption>
<table cellspacing="5" cellpadding="5" frame="box" rules="all">
<thead>
<tr>
<td valign="top" align="left" style="color:#ffffff;background-color: #7f8080;"></td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;">Wives&#x2019; behavioral patterns</td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;">Husbands&#x2019; behavioral patterns</td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;">Wives&#x2019; PHQ-9 score</td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;">Husbands&#x2019; PHQ-9 score</td>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Wives&#x2019; behavioral patterns</td>
<td valign="top" align="center">1.00</td>
<td/>
<td/>
<td/>
</tr>
<tr>
<td valign="top" align="left">Husbands&#x2019; behavioral patterns</td>
<td valign="top" align="center">0.15<xref ref-type="table-fn" rid="t2fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">1.00</td>
<td/>
<td/>
</tr>
<tr>
<td valign="top" align="left">Wives&#x2019; PHQ-9 score</td>
<td valign="top" align="center">0.12<xref ref-type="table-fn" rid="t2fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">0.04<xref ref-type="table-fn" rid="t2fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">1.00</td>
<td/>
</tr>
<tr>
<td valign="top" align="left">Husbands&#x2019; PHQ-9 score</td>
<td valign="top" align="center">0.03<xref ref-type="table-fn" rid="t2fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">0.11<xref ref-type="table-fn" rid="t2fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">0.12<xref ref-type="table-fn" rid="t2fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">1.00</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn id="t2fns1"><p>&#x002A;&#x002A;<italic>P</italic> &#x003C; 0.01.</p></fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="S3.SS4">
<title>3.4. Impact of behavioral patterns on depression symptoms at the dyadic level</title>
<p>As presented in <xref ref-type="fig" rid="F3">Figure 3</xref> and <xref ref-type="table" rid="T3">Table 3</xref>, the APIM analysis indicated that both the husband&#x2019;s and wife&#x2019;s behavioral patterns exhibited an actor effect on their own depression symptoms (&#x03B2; = 0.53, <italic>P</italic> &#x003C; 0.01; &#x03B2; = 0.58, <italic>P</italic> &#x003C; 0.01). Partner effects differed between genders; only wives&#x2019; behavioral patterns had a partner effect on husbands&#x2019; depression symptoms (&#x03B2; = 0.14, <italic>P</italic> &#x003C; 0.01). The partner effect of husbands&#x2019; behavioral patterns on wives&#x2019; depression symptoms was not significant (&#x03B2; = 0.04, <italic>P</italic> = 0.093). As a supplementary analysis, we examined the effect of each of the health-related behavior variables used in the LCA (<xref ref-type="supplementary-material" rid="DS1">Supplementary Table 5</xref>). The results were consistent with the main analysis.</p>
<fig id="F3" position="float">
<label>FIGURE 3</label>
<caption><p>APIM estimates of actor and partner effects of the husband&#x2019;s and wife&#x2019;s behavioral patterns on depression. &#x002A;&#x002A;<italic>P</italic> &#x003C; 0.01.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fpsyt-14-1242611-g003.tif"/>
</fig>
<table-wrap position="float" id="T3">
<label>TABLE 3</label>
<caption><p>APIM estimates of actor and partner effects of the husband&#x2019;s and wife&#x2019;s behavioral patterns on depression.</p></caption>
<table cellspacing="5" cellpadding="5" frame="box" rules="all">
<thead>
<tr>
<td valign="top" align="left" style="color:#ffffff;background-color: #7f8080;">Effect</td>
<td valign="top" align="center" colspan="2" style="color:#ffffff;background-color: #7f8080;">&#x03B2; (95% <italic>CI</italic>)</td>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left" style="color:#ffffff;background-color: #7f8080;"></td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;"><bold>Model 1</bold></td>
<td valign="top" align="center" style="color:#ffffff;background-color: #7f8080;"><bold>Model 2</bold></td>
</tr>
<tr>
<td valign="top" align="left" colspan="3" style="background-color: #dcdcdc;"><bold>Actor effect</bold></td>
</tr>
<tr>
<td valign="top" align="left">Wives&#x2019; behavioral patterns &#x2192; Wives&#x2019; PHQ-9 score</td>
<td valign="top" align="center">0.57 (0.51, 0.62)<xref ref-type="table-fn" rid="t3fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">0.58 (0.52, 0.64)<xref ref-type="table-fn" rid="t3fns1">&#x002A;&#x002A;</xref></td>
</tr>
<tr>
<td valign="top" align="left">Husbands&#x2019; behavioral patterns &#x2192; Husbands&#x2019; PHQ-9 score</td>
<td valign="top" align="center">0.52 (0.46, 0.57)<xref ref-type="table-fn" rid="t3fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">0.53 (0.47, 0.58)<xref ref-type="table-fn" rid="t3fns1">&#x002A;&#x002A;</xref></td>
</tr>
<tr>
<td valign="top" align="left" colspan="3" style="background-color: #dcdcdc;"><bold>Partner effect</bold></td>
</tr>
<tr>
<td valign="top" align="left">Wives&#x2019; behavioral patterns &#x2192; Husbands&#x2019; PHQ-9 score</td>
<td valign="top" align="center">0.12 (0.06, 0.19)<xref ref-type="table-fn" rid="t3fns1">&#x002A;&#x002A;</xref></td>
<td valign="top" align="center">0.14 (0.08, 0.20)<xref ref-type="table-fn" rid="t3fns1">&#x002A;&#x002A;</xref></td>
</tr>
<tr>
<td valign="top" align="left">Husbands&#x2019; behavioral patterns &#x2192; Wives&#x2019; PHQ-9 score</td>
<td valign="top" align="center">0.03 (&#x2212;0.02, 0.08)</td>
<td valign="top" align="center">0.04 (&#x2212;0.01, 0.09)</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn id="t3fns1"><p>Latent classes of couples&#x2019; health-related behavior were included as independent variables, while PHQ-9 score used as the dependent variable. Model 1, unadjusted confounders; Model 2, adjusted for region, age, BMI, education level, and annual income level. &#x002A;&#x002A;<italic>P</italic> &#x003C; 0.01.</p></fn>
</table-wrap-foot>
</table-wrap>
</sec>
</sec>
<sec id="S4" sec-type="discussion">
<title>4. Discussion</title>
<p>Although studies have demonstrated an association between behavioral patterns and depression symptoms, most have focused on a specific health-related behavior, or on individuals (<xref ref-type="bibr" rid="B14">14</xref>, <xref ref-type="bibr" rid="B15">15</xref>). The current study uses an LCA model to identify patterns of health-related behaviors. Additionally, the APIM approach was used to assess the relationship between behavioral patterns and depression symptoms among couples of childbearing age. The results showed that both wives&#x2019; and husbands&#x2019; behavioral patterns had a direct impact on their own depression symptoms. Interestingly, the wife&#x2019;s behavioral pattern was shown to have an impact on her husband&#x2019;s depression symptoms, demonstrating a significant partner effect.</p>
<p>Consistent with past research and our first hypothesis, we found that behavioral patterns and depression symptoms were correlated between couples. As couples often have similar or concordant mental and physical health as well as health behaviors, a theory of health concordance has been established (<xref ref-type="bibr" rid="B37">37</xref>). Furthermore, a systematic review suggested that both health behaviors and health behavior changes were generally more consistent among couples than among individuals in the general population (<xref ref-type="bibr" rid="B38">38</xref>). Even newly-married partners who lived together for a short time shared clear correlations in cardiovascular risk factors and were positively associated with depressive symptoms (<xref ref-type="bibr" rid="B39">39</xref>). According to the interpersonal theory of depression, people with depressive symptoms are affected and influenced by their interactions with others (<xref ref-type="bibr" rid="B40">40</xref>). Other dyadic studies also support this interdependence. For example, caregiver&#x2019;s depressive symptoms were significantly associated with care recipient&#x2019;s (<xref ref-type="bibr" rid="B41">41</xref>, <xref ref-type="bibr" rid="B42">42</xref>). In summary, this study highlights the importance of considering the influence of both partners&#x2019; behavioral patterns on individuals&#x2019; depression symptoms.</p>
<p>Our findings show that wives&#x2019; and husbands&#x2019; depression symptoms was affected by their own behavioral patterns (actor effect). Previous cross-sectional studies in China have shown that among both male and female participants, those with healthier behavioral patterns reported better mental health status (<xref ref-type="bibr" rid="B14">14</xref>, <xref ref-type="bibr" rid="B15">15</xref>). In a prospective cohort study of middle-aged and older adults in Europe, clustered unhealthy lifestyle behaviors were cross-sectionally associated with elevated depressive symptoms, and clustering of two, three, or four unhealthy lifestyle behaviors was prospectively associated with elevated depressive symptoms (<xref ref-type="bibr" rid="B43">43</xref>). This finding is consistent with the discussion on the importance of including different lifestyle behaviors in the formulation of policies aimed at preventing mental disorders (<xref ref-type="bibr" rid="B44">44</xref>). Each risky behavior may have different mechanisms related to depression. For individuals, the mechanisms by which less healthy behaviors increase the depression risk are not fully understood; however, inflammation may play an important role. For example, diet quality affects immune function and systemic inflammation levels (<xref ref-type="bibr" rid="B45">45</xref>), while smoking is associated with increased levels of acute phase proteins (<xref ref-type="bibr" rid="B46">46</xref>) and sleep deprivation is associated with alterations in cellular and natural immune functioning (<xref ref-type="bibr" rid="B47">47</xref>), thereby inducing depression.</p>
<p>The results of the partner effect analysis were partly consistent with our second hypothesis &#x2013; that the path between wives&#x2019; behavioral patterns and husbands&#x2019; depression symptoms was significant, but the path between husbands&#x2019; behavioral patterns and wives&#x2019; depression was not. If the wife is in the high-risk group, her husband has a significantly higher PHQ-9 score. That is, the depression symptoms of the husband is increased by the poor health behavior of the wife. Similar to our study, Miller and Mason conducted a study that also took into account the dyadic nature of depression. They examined the relationship between marital satisfaction and depression symptoms among 391 married couples, finding that wives&#x2019; marital satisfaction had a significantly impact on their husbands&#x2019; depression symptoms (<xref ref-type="bibr" rid="B48">48</xref>). Besides, they confirms that the individual&#x2019;s depression is not only affected by his own factors but also by his spouse&#x2019;s factors.</p>
<p>For couples, there are multiple pathways by which one spouse&#x2019;s behavioral patterns may influence the other&#x2019;s depression symptoms. One indirect pathway may be that an individual&#x2019;s behavioral patterns depend on their partner&#x2019;s behavioral patterns. Related to this, Umberson argued that many spouses monitor and attempt to control their spouses&#x2019; health behaviors (<xref ref-type="bibr" rid="B49">49</xref>). This is supported by the theory of interdependence: couple members can transform person-centered motivation into relationship-centered motivation (<xref ref-type="bibr" rid="B50">50</xref>). For instance, if one partner maintains a healthy behavioral pattern, both partners may strive to adopt healthy behavioral patterns as goals. One direct pathway is that one spouse&#x2019;s behavioral patterns may directly lead to changes in another spouse&#x2019;s depression. In a close relationship, individuals would perceive their partner&#x2019;s resources, perspectives, and characteristics as part of their own (<xref ref-type="bibr" rid="B51">51</xref>). If an individual perceives his/her partner&#x2019;s behavior patterns as deviating from his/her expectations, it can potentially negatively affect his/her emotional state. Evidence on health behavior change for couples shows that partners have a significant influence on individuals&#x2019; health, and the concordance of health behaviors in couples increases over time (<xref ref-type="bibr" rid="B38">38</xref>). Therefore, when examining the association between behavioral patterns and depression symptoms in couples, it is essential to consider the husband and wife as a whole, and more evidence should be provided.</p>
<p>One major strength of this study is that we used a large population-based sample of couples to examine the interactions within couples in terms of the relationships between behavioral patterns and depression symptoms. Another advantage is that we identified three distinct behavioral patterns for both wives and husbands, using LCA rather than individual behaviors. This is more in line with reality, as individuals are simultaneously exposed to multiple risky behaviors. Using APIM, we accounted for the interdependence that naturally exists between partners, which is rarely done in depression symptoms research (<xref ref-type="bibr" rid="B52">52</xref>). Our findings may hold implications for couple-based interventions, with the goal of reducing the future incidence of depression. Specifically, if a clinician identifies a person with unhealthy behaviors, it may be appropriate to recommend that his/her partner also be evaluated. It will encourage the couple to enhance mutual understanding, engage in joint planning and problem-solving for enacting behavior change, and engage in behavior change as a dyad. A partner can be seen as a coach to help partners change their unhealthy behaviors, as suggested by Baucom et al. (<xref ref-type="bibr" rid="B53">53</xref>).</p>
<p>Despite these strong findings, this study has some limitations. First, we used cross-sectional data; therefore, we could not rule out reverse causality. The association between behavioral patterns and depression symptoms is probably bidirectional (<xref ref-type="bibr" rid="B54">54</xref>). Second, the duration of cohabitation, which is an important confounding factor (<xref ref-type="bibr" rid="B55">55</xref>), was not specifically ascertained among our participants. Future research should consider the duration of cohabitation when estimating the association between behavioral patterns and depression. Third, although we adjusted for as many potential confounders as possible, there are still residual confounders (i.e., mental and physical health, time spent outdoors, and screen time) (<xref ref-type="bibr" rid="B44">44</xref>, <xref ref-type="bibr" rid="B56">56</xref>). Fourth, we used the PHQ-9 to assess depression symptom. Although this self-report scale assessment method is very suitable for epidemiological investigation, it will inevitably lead to report bias and misclassification. In the future, prospective studies should elucidate the nature of the causal relationship between behavioral patterns and depression symptoms, and more unhealthy lifestyle factors should be included to confirm the current findings.</p>
</sec>
<sec id="S5" sec-type="conclusion">
<title>5. Conclusion</title>
<p>This study adds to the growing body of literature by providing evidence that spouses&#x2019; behavioral patterns and depression symptoms are intertwined, which has potential clinical implications. Our findings suggest that couple-based interventions are required to improve husbands&#x2019; psychological wellbeing.</p>
</sec>
<sec id="S6" sec-type="data-availability">
<title>Data availability statement</title>
<p>The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.</p>
</sec>
<sec id="S7" sec-type="ethics-statement">
<title>Ethics statement</title>
<p>The studies involving humans were approved by the Ethics Committee of Anhui Medical University. The studies were conducted in accordance with the local legislation and institutional requirements. The participants provided their written informed consent to participate in this study.</p>
</sec>
<sec id="S8" sec-type="author-contributions">
<title>Author contributions</title>
<p>QY: writing-original draft, formal analysis, and writing-review and editing. XG, ML, and GP: statistical analysis and editing. HG, BW, and YT: manuscript preparation and drafting the manuscript. PZ and SB: writing&#x2013;review and editing. SS: critical revision and writing-review and editing. FT: conceptualization, funding acquisition, and writing-review and editing. All authors contributed to and approved the final manuscript.</p>
</sec>
</body>
<back>
<sec id="S9" sec-type="funding-information">
<title>Funding</title>
<p>This study was supported by the Research Level Improvement Plan of Anhui Medical University (No. 2019xkjT006), the National Key Research and Development Project of China (No. 2018YFC1004201), the National Natural Science Foundation of China (No. 82273638), and the Key Program of Natural Science Research of Higher Education of Anhui Province (No. 2022AH050672).</p>
</sec>
<ack><p>We are extremely grateful to all the research investigators and participants who participated in the survey. We are also extremely grateful to all partners from the 16 districts/county maternal and Child Health Centers.</p>
</ack>
<sec id="S10" sec-type="COI-statement">
<title>Conflict of interest</title>
<p>The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec id="S11" sec-type="disclaimer">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
<sec id="S12" sec-type="supplementary-material">
<title>Supplementary material</title>
<p>The Supplementary Material for this article can be found online at: <ext-link ext-link-type="uri" xlink:href="https://www.frontiersin.org/articles/10.3389/fpsyt.2023.1242611/full#supplementary-material">https://www.frontiersin.org/articles/10.3389/fpsyt.2023.1242611/full#supplementary-material</ext-link></p>
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