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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Big Data</journal-id>
<journal-title-group>
<journal-title>Frontiers in Big Data</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Big Data</abbrev-journal-title>
</journal-title-group>
<issn pub-type="epub">2624-909X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
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<article-meta>
<article-id pub-id-type="doi">10.3389/fdata.2025.1666962</article-id>
<article-version article-version-type="Version of Record" vocab="NISO-RP-8-2008"/>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Original Research</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Application and comparison of ARIMA, LSTM, and ARIMA-LSTM models for predicting foodborne diseases in Liaoning Province</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name><surname>Du</surname> <given-names>Xiaoxiao</given-names></name>
<xref ref-type="aff" rid="aff1"/>
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<role vocab="credit" vocab-identifier="https://credit.niso.org/" vocab-term="Writing &#x2013; original draft" vocab-term-identifier="https://credit.niso.org/contributor-roles/writing-original-draft/">Writing &#x2013; original draft</role>
<role vocab="credit" vocab-identifier="https://credit.niso.org/" vocab-term="Methodology" vocab-term-identifier="https://credit.niso.org/contributor-roles/methodology/">Methodology</role>
<uri xlink:href="https://loop.frontiersin.org/people/3135065"/>
</contrib>
<contrib contrib-type="author">
<name><surname>Yu</surname> <given-names>Haomiao</given-names></name>
<xref ref-type="aff" rid="aff1"/>
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</contrib>
<contrib contrib-type="author">
<name><surname>Zhang</surname> <given-names>Hao</given-names></name>
<xref ref-type="aff" rid="aff1"/>
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</contrib>
<contrib contrib-type="author">
<name><surname>Liu</surname> <given-names>Xiangyun</given-names></name>
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<contrib contrib-type="author">
<name><surname>Yu</surname> <given-names>Xinling</given-names></name>
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<uri xlink:href="https://loop.frontiersin.org/people/3211020"/>
</contrib>
<contrib contrib-type="author" corresp="yes">
<name><surname>Xie</surname> <given-names>Tao</given-names></name>
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<xref ref-type="corresp" rid="c001"><sup>&#x0002A;</sup></xref>
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<contrib contrib-type="author" corresp="yes">
<name><surname>Diao</surname> <given-names>Wenli</given-names></name>
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<xref ref-type="corresp" rid="c001"><sup>&#x0002A;</sup></xref>
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<aff id="aff1"><institution>Liaoning Provincial Center for Disease Control and Prevent</institution>, <city>Shenyang, Liaoning</city>, <country country="cn">China</country></aff>
<author-notes>
<corresp id="c001"><label>&#x0002A;</label>Correspondence: Tao Xie, <email xlink:href="mailto:xietao@lncdc.com">xietao@lncdc.com</email>; Wenli Diao, <email xlink:href="mailto:diaodwl@163.com">diaodwl@163.com</email></corresp>
</author-notes>
<pub-date publication-format="electronic" date-type="pub" iso-8601-date="2025-11-12">
<day>12</day>
<month>11</month>
<year>2025</year>
</pub-date>
<pub-date publication-format="electronic" date-type="collection">
<year>2025</year>
</pub-date>
<volume>8</volume>
<elocation-id>1666962</elocation-id>
<history>
<date date-type="received">
<day>18</day>
<month>07</month>
<year>2025</year>
</date>
<date date-type="accepted">
<day>23</day>
<month>10</month>
<year>2025</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#x000A9; 2025 Du, Yu, Zhang, Liu, Yu, Xie and Diao.</copyright-statement>
<copyright-year>2025</copyright-year>
<copyright-holder>Du, Yu, Zhang, Liu, Yu, Xie and Diao</copyright-holder>
<license>
<ali:license_ref start_date="2025-11-12">https://creativecommons.org/licenses/by/4.0/</ali:license_ref>
<license-p>This is an open-access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="https://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License (CC BY)</ext-link>. 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.</license-p>
</license>
</permissions>
<abstract>
<sec>
<title>Objective</title>
<p>To compare the application of the ARIMA model, the Long Short-Term Memory (LSTM) model and the ARIMA-LSTM model in forecasting foodborne disease incidence.</p></sec>
<sec>
<title>Methods</title>
<p>Monthly case data of foodborne diseases in Liaoning Province from January 2015 to December 2023 were used to construct ARIMA, LSTM, and ARIMA-LSTM models. These three models were then applied to forecast the monthly incidence of foodborne diseases in 2024, and their predictions were compared with those of a baseline model. Model performance was evaluated by comparing the predicted and observed values using root mean square error (RMSE), mean absolute error (MAE), and mean absolute percentage error (MAPE), allowing identification of the optimal model. The best-performing model was subsequently employed to predict the monthly incidence for 2025.</p></sec>
<sec>
<title>Results</title>
<p>The ARIMA-LSTM model was identified as the optimal model. Specifically, the ARIMA (2,0,0) (0,1,1)1<sub>2</sub> model produced RMSE = 300.03, MAE = 187.11, and MAPE = 16.38%, while the LSTM model yielded RMSE = 408.71, MAE = 226.03, and MAPE = 17.21%. In contrast, the ARIMA-LSTM model achieved RMSE = 0.44, MAE = 0.44, and MAPE = 0.08%, representing a dramatic improvement over the baseline model (RMSE = 204.17, MAE = 146.75, MAPE = 15.62%), with reductions of 99.5%, 99.7%, and 99.4% in RMSE, MAE, and MAPE, respectively. Based on the ARIMA&#x02013;LSTM model, the predicted monthly cases of foodborne diseases for 2025 are: 214.62 (Jan), 260.84 (Feb), 462.92 (Mar), 590.92 (Apr), 800.88 (May), 965.11 (Jun), 2410.36 (Jul), 2651.36 (Aug), 1711.15 (Sep), 941.22 (Oct), 628.21 (Nov), and 465.05 (Dec).</p></sec>
<sec>
<title>Conclusion</title>
<p>The ARIMA-LSTM model is considered the optimal model for predicting foodborne disease incidence in Liaoning Province in 2025.</p></sec></abstract>
<kwd-group>
<kwd>foodborne</kwd>
<kwd>ARIMA model</kwd>
<kwd>LSTM model</kwd>
<kwd>ARIMA-LSTM model</kwd>
<kwd>predicting</kwd>
</kwd-group>
<funding-group>
 <funding-statement>The author(s) declare that financial support was received for the research and/or publication of this article. This study was supported by funding from the Key Research and Development Program of Liaoning Province (2024JH2/102500073).</funding-statement>
</funding-group>
<counts>
<fig-count count="10"/>
<table-count count="5"/>
<equation-count count="1"/>
<ref-count count="27"/>
<page-count count="10"/>
<word-count count="5038"/>
</counts>
<custom-meta-group>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Medicine and Public Health</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body>
<sec sec-type="intro" id="s1">
<label>1</label>
<title>Introduction</title>
<p>Foodborne diseases represent one of the most critical global public health challenges, significantly impacting human health and quality of life (<xref ref-type="bibr" rid="B14">Ntshoe et al., 2021</xref>). According to World Health Organization (WHO) data, millions of people worldwide fall ill or die annually due to foodborne illnesses. In 2015, the WHO released its first global estimates of foodborne disease burden, revealing that nearly 1 in 10 people globally suffer from illnesses caused by contaminated food each year, resulting in 420,000 deaths and the loss of 33 million healthy life-years (DALYs) (<xref ref-type="bibr" rid="B8">Kirk et al., 2015</xref>).</p>
<p>Foodborne diseases exhibit notable seasonal patterns (<xref ref-type="bibr" rid="B26">Yu et al., 2024</xref>). Therefore, developing predictive models based on historical incidence data can provide valuable support for the prevention and control of foodborne diseases. The ARIMA model is a commonly used method in infectious disease forecasting and is particularly well-suited for seasonal data. However, foodborne disease incidence is also influenced by factors such as geography, climate, and socioeconomic conditions, leading to nonlinear trends (<xref ref-type="bibr" rid="B22">Siguo et al., 2022</xref>; <xref ref-type="bibr" rid="B16">Pijnacker et al., 2024</xref>). The LSTM model, with its capacity for nonlinear fitting and its ability to capture temporal patterns in data, may improve forecasting accuracy (<xref ref-type="bibr" rid="B5">Gao et al., 2025</xref>). The ARIMA model performs well in capturing linear trends and seasonality (<xref ref-type="bibr" rid="B2">Balawi and Tenekeci, 2024</xref>); however, it assumes that the data-generating process is primarily linear, making it difficult to model complex nonlinear dynamics (<xref ref-type="bibr" rid="B19">Sattarzadeh et al., 2025</xref>). In recent years, Long Short-Term Memory (LSTM) networks have demonstrated strong capabilities in time series forecasting, particularly in handling long-term dependencies and nonlinear features (<xref ref-type="bibr" rid="B11">Mahmoudi, 2025</xref>). Nevertheless, using LSTM alone also has limitations, such as requiring a relatively large amount of training data and being less efficient in modeling linear components (<xref ref-type="bibr" rid="B9">Lim and Zohren, 2021</xref>). To overcome the shortcomings of individual models, researchers have proposed the ARIMA&#x02013;LSTM hybrid model (<xref ref-type="bibr" rid="B18">Ray et al., 2023</xref>).</p>
<p>In this study, we constructed ARIMA, LSTM, and ARIMA-LSTM hybrid models using foodborne disease data from 2015 to 2023. These three models were employed to predict the monthly number of foodborne disease cases in 2024, and the predictions were compared with the actual reported cases as well as with a baseline model to identify the most accurate model. Finally, the optimal model was applied to forecast the number of cases in 2025, providing a scientific basis for the development of prevention and control strategies for foodborne diseases in Liaoning Province.</p></sec>
<sec sec-type="materials|methods" id="s2">
<label>2</label>
<title>Materials and methods</title>
<sec>
<label>2.1</label>
<title>Data sources</title>
<p>Monthly case counts of foodborne diseases from January 2015 to December 2024 were extracted from the Liaoning Provincial Foodborne Disease Risk Surveillance System. The dataset from January 2015 to December 2023 served as the training set, while the data from 2024 were used as the validation set for model evaluation.</p>
</sec>
<sec>
<label>2.2</label>
<title>Research methods</title>
<sec>
<label>2.2.1</label>
<title>ARIMA model</title>
<p>The construction process of the ARIMA model is shown in <xref ref-type="fig" rid="F1">Figure 1</xref>.</p>
<fig position="float" id="F1">
<label>Figure 1</label>
<caption><p>Flowchart of ARIMA model construction.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0001.tif">
<alt-text content-type="machine-generated">Flowchart illustrating a data processing sequence: Data Collection, Series Stationarization, Model Identification, Model Diagnostics, and Model Forecasting and Evaluation, connected vertically by arrows.</alt-text>
</graphic>
</fig>
<p>The autoregressive integrated moving average (ARIMA) model is a linear, univariate time series model that combines three components: autoregression (AR), differencing (I), and moving average (MA) (<xref ref-type="bibr" rid="B23">Wagner and Cleland, 2023</xref>). Its general form can be expressed as:</p>
<disp-formula id="E1"><mml:math id="M1"><mml:mtable columnalign="left"><mml:mtr><mml:mtd><mml:mi>A</mml:mi><mml:mi>R</mml:mi><mml:mi>I</mml:mi><mml:mi>M</mml:mi><mml:mi>A</mml:mi><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mrow><mml:mi>p</mml:mi><mml:mo>,</mml:mo><mml:mi>d</mml:mi><mml:mo>,</mml:mo><mml:mi>q</mml:mi></mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mo>:</mml:mo><mml:mtext>&#x000A0;</mml:mtext><mml:mi>&#x003C6;</mml:mi><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:msup><mml:mrow><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mrow><mml:mn>1</mml:mn><mml:mo>-</mml:mo><mml:mi>B</mml:mi></mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:mrow><mml:mrow><mml:mi>d</mml:mi></mml:mrow></mml:msup><mml:mi>y</mml:mi><mml:mi>t</mml:mi><mml:mo>=</mml:mo><mml:mi>&#x003B8;</mml:mi><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mo stretchy="false">)</mml:mo></mml:mrow><mml:mi>&#x003B5;</mml:mi><mml:mi>t</mml:mi></mml:mtd></mml:mtr></mml:mtable></mml:math></disp-formula>
<p>Where <italic>yt</italic> denotes the observed value at time <italic>t, B</italic> is the backward shift operator <italic>(Byt</italic> = <italic>y</italic><sub><italic>t</italic>&#x02212;1</sub><italic>)</italic>, and <italic>d</italic> represents the order of differencing required to achieve stationarity. The autoregressive component is defined as &#x003C6;<italic>(B)</italic>=<italic>1&#x02013;</italic>&#x003C6;<sub>1</sub><italic>B&#x02013;</italic>&#x003C6;<sub>2</sub><italic>...B</italic><sup>2</sup><italic>-...&#x02013;</italic>&#x003C6;<sub><italic>p</italic></sub><italic>B</italic><sup><italic>p</italic></sup>, while the moving average component is defined as &#x003B8;<italic>(B)</italic>=<italic>1</italic>&#x0002B;&#x003B8;<sub>1</sub><italic>B</italic>&#x0002B;&#x003B8;<sub>2</sub><italic>B</italic><sup>2</sup>&#x0002B;<italic>..</italic>.&#x0002B;&#x003B8;<sub><italic>q</italic></sub><italic>B</italic><sup><italic>q</italic></sup>. The error term &#x003B5;<italic>t</italic> represents white noise.</p>
<p>In practice, the differencing operator <italic>(1&#x02013;B)</italic><sup><italic>d</italic></sup> is applied to remove non-stationarity in the series. The AR part captures the dependence of the current observation on its past values, whereas the MA part accounts for the dependency on past forecast errors. By integrating these three components, ARIMA provides a flexible yet interpretable framework for modeling and forecasting time series data.</p>
<p>Considering the seasonal characteristics of foodborne diseases, the model structure was specified as ARIMA (p,d,q) (P, D, Q)s, where:</p>
<list list-type="bullet">
<list-item><p>p and q represent the orders of non-seasonal autoregression and moving average, respectively;</p></list-item>
<list-item><p>d denotes the degree of non-seasonal differencing;</p></list-item>
<list-item><p>P and Q indicate the seasonal autoregressive and moving average orders;</p></list-item>
<list-item><p>D stands for seasonal differencing;</p></list-item>
<list-item><p>s corresponds to the seasonal period length.</p></list-item>
</list>
<sec>
<label>2.2.1.1</label>
<title>Series stationarization</title>
<p>Prior to modeling, the time series must be tested for stationarity using the ADF test. For non-stationary series, appropriate transformations (e.g., Box-Cox transformations, seasonal differencing) are applied until stationarity is confirmed via repeated testing.</p></sec>
<sec>
<label>2.2.1.2</label>
<title>Model identification</title>
<p>The autocorrelation function (ACF) and partial autocorrelation function (PACF) plots are examined to determine the preliminary model structure. Based on the ACF and PACF patterns, initial parameters are identified (typically with orders not exceeding 2) (<xref ref-type="bibr" rid="B15">Peng, 2014</xref>). The Akaike Information Criterion (AIC) and Bayesian Information Criterion (BIC) are then computed, and the model with the lowest AIC and BIC values is selected as the optimal model.</p></sec>
<sec>
<label>2.2.1.3</label>
<title>Model diagnostics</title>
<p><italic>Residual diagnostics</italic> were conducted using the Ljung-Box test for white noise. The non-significant test result (<italic>P</italic> &#x0003E; 0.05) confirms the residuals are uncorrelated, validating the model&#x00027;s suitability for predictions.</p></sec>
<sec>
<label>2.2.1.4</label>
<title>Model forecasting</title>
<p>The final selected optimal model was employed for prediction. The goodness-of-fit between the actual and predicted values across the entire series was evaluated using the RMSE, MAE, MAPE.</p>
</sec>
</sec>
<sec>
<label>2.2.2</label>
<title>LSTM model</title>
<p>The Long Short-Term Memory (LSTM) model is a specialized type of recurrent neural network (RNN) that incorporates memory cells along with three gating mechanisms&#x02014;namely, the input gate, forget gate, and output gate (<xref ref-type="bibr" rid="B1">Aldrich et al., 2022</xref>). These gates regulate the flow of information and enable the model to selectively retain or discard information, thereby effectively addressing the issues of vanishing and exploding gradients commonly encountered in modeling long time series with traditional RNNs (<xref ref-type="bibr" rid="B12">Malashin et al., 2024</xref>).</p>
<p>Prior to model construction, all time series data were normalized to the range [0, 1] using the Min&#x02013;Max scaling method to ensure numerical stability during training. Input sequences were generated with a fixed time window, where the values from the preceding N time steps were used to predict the next observation. The dataset was divided into a training set and a validation set to assess model performance (<xref ref-type="fig" rid="F2">Figure 2</xref>).</p>
<fig position="float" id="F2">
<label>Figure 2</label>
<caption><p>Flowchart of LSTM model development.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0002.tif">
<alt-text content-type="machine-generated">Flowchart depicting the process of a machine learning model with five steps: Input Data, Data Preprocessing including normalization and data splitting, LSTM Network Architecture with input, hidden, and dense layers, Model Training, Prediction Output, and Model Evaluation using RMSE, MAE, MAPE, and F1-score.</alt-text>
</graphic>
</fig>
<p>The long short-term memory (LSTM) network was implemented with the following architecture and configurations:</p>
<p>Hidden units: determining the model&#x00027;s capacity to capture temporal dependencies.</p>
<p>Number of LSTM layers: to balance model complexity and computational efficiency.</p>
<p>Dropout rate: a dropout rate of 0.2 was applied to mitigate overfitting.</p>
<p>Activation functions: tanh and sigmoid, as defined by the standard LSTM architecture.</p>
<p>Optimizer: Adam with a learning rate of 0.001.</p>
<p>Loss function: mean squared error (MSE), suitable for continuous-valued predictions.</p>
<p>Batch size: defined the number of samples.</p>
<p>Epochs: with an early stopping criterion to prevent overfitting, and early stopping strategy was employed based on the validation loss with a patience of 10 epochs.</p></sec>
<sec>
<label>2.2.3</label>
<title>ARIMA-LSTM model</title>
<p>The following is a simplified flowchart for constructing the ARIMA&#x02013;LSTM model (<xref ref-type="fig" rid="F3">Figure 3</xref>).</p>
<fig position="float" id="F3">
<label>Figure 3</label>
<caption><p>Flowchart of ARIMA&#x02013;LSTM model construction.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0003.tif">
<alt-text content-type="machine-generated">Flowchart illustrating a hybrid prediction process: Data Collection, Data Preprocessing, ARIMA Modeling, Residual Extraction, LSTM Modeling, Hybrid Prediction (ARIMA + LSTM), and Model Evaluation. Each step is connected by downward arrows.</alt-text>
</graphic>
</fig>
<p>First, the collected data were organized and preprocessed. An ARIMA model was then constructed using the processed data to generate forecasts, which were compared with the observed values to obtain the residuals. The residuals were subsequently modeled with an LSTM network to capture their nonlinear characteristics, producing forecasts of the residual component. Finally, the predictions from the ARIMA model and the LSTM residual forecasts were combined to obtain the predictions of the hybrid model.</p></sec>
<sec>
<label>2.2.4</label>
<title>Baseline model</title>
<p>Since foodborne diseases exhibit seasonality, the Seasonal Na&#x000EF;ve method can be used as a baseline model. This approach is a simple yet commonly applied time series forecasting method for data with seasonal patterns, where the forecast value is set equal to the observation from the same point in the previous season.</p>
<p>&#x00177;<sub><italic>t</italic></sub> &#x0003D; <italic>y</italic><sub><italic>t</italic>&#x02212;<italic>s</italic></sub></p>
<p>Here, <italic>s</italic> is the length of the seasonal period, &#x00177;<sub><italic>t</italic></sub> is the forecasted value, <italic>y</italic><sub><italic>t</italic>&#x02212;<italic>s</italic></sub> and is the observed value from the same month in the previous year or the same quarter in the previous season.</p></sec>
<sec>
<label>2.2.5</label>
<title>Model evaluation metrics</title>
<p>In this study, model performance in terms of fitting and forecasting was assessed using RMSE, MAE, MAPE value of less than 10% indicates excellent predictive performance, values between 10% and 20% indicate good performance, and values below 40% are considered acceptable.</p></sec>
<sec>
<label>2.2.6</label>
<title>Statistical methods</title>
<p>Data were organized using Excel 2019. The ARIMA model was constructed using R 4.4.2 software, while the LSTM model and the ARIMA-LSTM model were developed using Python 3.13. A significance level of &#x003B1; = 0.05 was adopted, and <italic>P</italic>-values less than 0.05 were considered statistically significant.</p>
</sec>
</sec>
</sec>
<sec sec-type="results" id="s3">
<label>3</label>
<title>Results</title>
<sec>
<label>3.1</label>
<title>ARIMA model construction</title>
<sec>
<label>3.1.1</label>
<title>Time series stationarity</title>
<p>The stationarity of the raw time series data (<xref ref-type="fig" rid="F4">Figure 4</xref>) was examined through the Augmented Dickey-Fuller test (ADF). A statistically significant <italic>p</italic>-value (<italic>P</italic> = 0.01 &#x0003C; 0.05) suggested the rejection of the null hypothesis, demonstrating that the data followed a stationary time series pattern; therefore, <italic>d</italic> = 0.</p>
<fig position="float" id="F4">
<label>Figure 4</label>
<caption><p>The epidemiological trend of reported foodborne disease cases in Liaoning Province, 2015&#x02013;2023.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0004.tif">
<alt-text content-type="machine-generated">Line graph showing number fluctuations over time from 2016 to 2024. Peaks in numbers occur around 2016, 2017, and 2018, with a gradual decline in peak heights in subsequent years.</alt-text>
</graphic>
</fig>
</sec>
<sec>
<label>3.1.2</label>
<title>Model identification and order determination</title>
<p>Seasonality was removed by applying seasonal differencing identified through <italic>nsdiffs()</italic> function, resulting in D = 1. Following the principle of model parsimony and practical experience, the orders of p, q, P, and Q were generally limited to no more than 2. Examination of the ACF and PACF plots (<xref ref-type="fig" rid="F5">Figure 5</xref>), together with parameter optimization using the <italic>auto.arima</italic> function from the R <italic>forecast</italic> package and consideration of AIC/BIC minimization criteria, led to the selection of ARIMA (2,0,0) (0,1,1)1<sub>2</sub> as the optimal model (AICc = 1,548.26).</p>
<fig position="float" id="F5">
<label>Figure 5</label>
<caption><p>The ACF and PACF plots after first-order seasonal differencing. ACF, autocorrelation function; PACF, partial autocorrelation function.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0005.tif">
<alt-text content-type="machine-generated">Side-by-side bar graphs showing ACF and PACF for lags 1 to 24. The ACF graph has significant spikes at lower lags with gradually decreasing values. The PACF graph has a strong spike at lag 1, with values decreasing around zero for other lags. Horizontal lines indicate confidence intervals.</alt-text>
</graphic>
</fig>
</sec>
<sec>
<label>3.1.3</label>
<title>Model diagnostics</title>
<p>The Box-Ljung test for white noise produced a <italic>p</italic>-value of 0.9696 (<italic>P</italic> &#x0003E; 0.05), confirming that the model residuals exhibit white noise behavior, suggesting all extractable information from the time series has been captured. The autocorrelation (ACF) and partial autocorrelation (PACF) plots of the residual series (<xref ref-type="fig" rid="F6">Figure 6</xref>) show that nearly all residuals fall within the 95% confidence intervals, demonstrating the model&#x00027;s adequacy for forecasting.</p>
<fig position="float" id="F6">
<label>Figure 6</label>
<caption><p>ACF and PACF plots of the residual series from the fitted ARIMA (2,0,0) (0,1,1)<sub>12</sub> model. ACF, autocorrelation function; PACF, partial autocorrelation function.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0006.tif">
<alt-text content-type="machine-generated">Two side-by-side bar graphs displaying residual autocorrelation function (ACF) and partial autocorrelation function (PACF) for lags ranging from 1 to 24. Both charts show vertical bars for each lag, indicating correlation values. Horizontal lines at 0.2 and -0.2 signify confidence intervals. The ACF chart has higher peaks around lag 12, while the PACF chart shows significant peaks primarily across several initial lags.</alt-text>
</graphic>
</fig>
</sec>
<sec>
<label>3.1.4</label>
<title>Model fitting</title>
<p>The monthly incidence of foodborne diseases from 2015 to 2023 was fitted using a seasonal ARIMA (2,0,0) (0,1,1)1<sub>2</sub> model. The fitted values exhibited strong agreement with the observed data trends (<xref ref-type="fig" rid="F7">Figure 7</xref>). The model was then applied to forecast case numbers for January to December 2024 (<xref ref-type="table" rid="T1">Table 1</xref>).</p>
<fig position="float" id="F7">
<label>Figure 7</label>
<caption><p>The epidemiological trends of observed vs. fitted data for foodborne diseases (2015-2023). The shaded zone represents the 95% confidence interval of the fitted values.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0007.tif">
<alt-text content-type="machine-generated">Line graph showing ARIMA model fit with observed values and 95% confidence interval from 2015 to 2023. The black line indicates observed values, and the red dashed line shows the fitted model. Peaks occur annually with varying intensity, and the shaded area represents the confidence interval.</alt-text>
</graphic>
</fig>
<table-wrap position="float" id="T1">
<label>Table 1</label>
<caption><p>Comparison between predicted and observed monthly incidence of foodborne diseases in 2024 (case).</p></caption>
<table frame="box" rules="all">
<thead>
<tr>
<th valign="top" align="left"><bold>Time</bold></th>
<th valign="top" align="center"><bold>Predicted values</bold></th>
<th valign="top" align="center"><bold>Actual values</bold></th>
<th valign="top" align="center"><bold>95% LCL</bold></th>
<th valign="top" align="center"><bold>95% UCL</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Jan</td>
<td valign="top" align="center">231.81</td>
<td valign="top" align="center">277</td>
<td valign="top" align="center">&#x02212;1,217.18</td>
<td valign="top" align="center">1,680.80</td>
</tr>
<tr>
<td valign="top" align="left">Feb</td>
<td valign="top" align="center">274.95</td>
<td valign="top" align="center">182</td>
<td valign="top" align="center">&#x02212;1,901.10</td>
<td valign="top" align="center">2,451.00</td>
</tr>
<tr>
<td valign="top" align="left">Mar</td>
<td valign="top" align="center">470.81</td>
<td valign="top" align="center">421</td>
<td valign="top" align="center">&#x02212;2,061.32</td>
<td valign="top" align="center">3,002.94</td>
</tr>
<tr>
<td valign="top" align="left">Apr</td>
<td valign="top" align="center">594.76</td>
<td valign="top" align="center">593</td>
<td valign="top" align="center">&#x02212;2,080.54</td>
<td valign="top" align="center">3,270.06</td>
</tr>
<tr>
<td valign="top" align="left">May</td>
<td valign="top" align="center">802.44</td>
<td valign="top" align="center">845</td>
<td valign="top" align="center">&#x02212;1,919.01</td>
<td valign="top" align="center">3,523.89</td>
</tr>
<tr>
<td valign="top" align="left">Jun</td>
<td valign="top" align="center">965.57</td>
<td valign="top" align="center">1,281</td>
<td valign="top" align="center">&#x02212;1,767.05</td>
<td valign="top" align="center">3,698.19</td>
</tr>
<tr>
<td valign="top" align="left">Jul</td>
<td valign="top" align="center">2,410.42</td>
<td valign="top" align="center">2,848</td>
<td valign="top" align="center">&#x02212;323.88</td>
<td valign="top" align="center">5,144.72</td>
</tr>
<tr>
<td valign="top" align="left">Aug</td>
<td valign="top" align="center">2,651.36</td>
<td valign="top" align="center">3,484</td>
<td valign="top" align="center">&#x02212;83.00</td>
<td valign="top" align="center">5,385.73</td>
</tr>
<tr>
<td valign="top" align="left">Sept</td>
<td valign="top" align="center">1,711.24</td>
<td valign="top" align="center">1,739</td>
<td valign="top" align="center">&#x02212;1,023.16</td>
<td valign="top" align="center">4,445.64</td>
</tr>
<tr>
<td valign="top" align="left">Oct</td>
<td valign="top" align="center">841.42</td>
<td valign="top" align="center">1,108</td>
<td valign="top" align="center">&#x02212;1,793.07</td>
<td valign="top" align="center">3,675.92</td>
</tr>
<tr>
<td valign="top" align="left">Nov</td>
<td valign="top" align="center">628.51</td>
<td valign="top" align="center">683</td>
<td valign="top" align="center">&#x02212;2,106.06</td>
<td valign="top" align="center">3,363.08</td>
</tr>
<tr>
<td valign="top" align="left">Dec</td>
<td valign="top" align="center">465.42</td>
<td valign="top" align="center">544</td>
<td valign="top" align="center">&#x02212;2,269.19</td>
<td valign="top" align="center">3,200.02</td>
</tr></tbody>
</table>
<table-wrap-foot>
<p>LCL, Lower confidence limit; UCL, Upper confidence limit.</p>
</table-wrap-foot>
</table-wrap>
</sec>
</sec>
<sec>
<label>3.2</label>
<title>LSTM model development</title>
<p>An LSTM model was constructed using data from 2015 to 2023 as the training set and data from 2024 as the validation set. The data were normalized to a range between 0 and 1 prior to model construction. Given the seasonal characteristics of the dataset, a time step of 12 was selected as optimal. For a comprehensive consideration of avoiding overfitting, maintaining computational efficiency, and ensuring interpretability, the LSTM model consists of two layers: an LSTM layer and a Dense layer, and each with 50 hidden units. The Adam optimizer was employed, with mean squared error (MSE) used as the loss function. The Adam optimizer was selected due to its adaptive learning rate mechanism, fast convergence, and robustness, which make it a widely adopted and effective choice for time series prediction tasks. The batch size was set to 12. The model was trained for 200 epochs. After training, both the fitted and predicted values were denormalized (<xref ref-type="fig" rid="F8">Figure 8</xref>). Based on this model, monthly case numbers for 2024 were forecasted and compared with the observed values (<xref ref-type="table" rid="T2">Table 2</xref>).</p>
<fig position="float" id="F8">
<label>Figure 8</label>
<caption><p>Comparison of trends between fitted and actual values from 2015 to 2023, as well as the forecast for 2024. Blue line, True value; Orange line, Fitted value; Green line, Predicted value.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0008.tif">
<alt-text content-type="machine-generated">Line chart displaying LSTM model predictions from 2015 to early 2024. Three lines represent actual values, predicted values, and future predictions. Peaks occur annually, with actual and predicted values closely matching. The future trend shows a decline after 2023. The x-axis is time in years and months, and the y-axis is the number of cases.</alt-text>
</graphic>
</fig>
<table-wrap position="float" id="T2">
<label>Table 2</label>
<caption><p>Comparison between predicted and actual values for 2024 (case).</p></caption>
<table frame="box" rules="all">
<thead>
<tr>
<th valign="top" align="left"><bold>Time</bold></th>
<th valign="top" align="center"><bold>Predicted values</bold></th>
<th valign="top" align="center"><bold>Actual values</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Jan</td>
<td valign="top" align="center">300.35</td>
<td valign="top" align="center">227</td>
</tr>
<tr>
<td valign="top" align="left">Feb</td>
<td valign="top" align="center">258.13</td>
<td valign="top" align="center">182</td>
</tr>
<tr>
<td valign="top" align="left">Mar</td>
<td valign="top" align="center">323.40</td>
<td valign="top" align="center">421</td>
</tr>
<tr>
<td valign="top" align="left">Apr</td>
<td valign="top" align="center">520.96</td>
<td valign="top" align="center">593</td>
</tr>
<tr>
<td valign="top" align="left">May</td>
<td valign="top" align="center">896.40</td>
<td valign="top" align="center">845</td>
</tr>
<tr>
<td valign="top" align="left">Jun</td>
<td valign="top" align="center">1,470.41</td>
<td valign="top" align="center">1,281</td>
</tr>
<tr>
<td valign="top" align="left">Jul</td>
<td valign="top" align="center">2,129.49</td>
<td valign="top" align="center">2,848</td>
</tr>
<tr>
<td valign="top" align="left">Aug</td>
<td valign="top" align="center">2,302.45</td>
<td valign="top" align="center">3,484</td>
</tr>
<tr>
<td valign="top" align="left">Sept</td>
<td valign="top" align="center">1,765.14</td>
<td valign="top" align="center">1,739</td>
</tr>
<tr>
<td valign="top" align="left">Oct</td>
<td valign="top" align="center">1,168.87</td>
<td valign="top" align="center">1,108</td>
</tr>
<tr>
<td valign="top" align="left">Nov</td>
<td valign="top" align="center">718.35</td>
<td valign="top" align="center">683</td>
</tr>
<tr>
<td valign="top" align="left">Dec</td>
<td valign="top" align="center">445.62</td>
<td valign="top" align="center">544</td>
</tr></tbody>
</table>
</table-wrap>
</sec>
<sec>
<label>3.3</label>
<title>ARIMA-LSTM model construction</title>
<p>Since the ARIMA forecasts had already been obtained, the corresponding residuals were calculated and used to build an LSTM model. Residuals from 2015 to 2023 were used for training, and those from 2024 for validation. To reduce overfitting while maintaining efficiency, the model included one LSTM layer and one Dense layer, with 64 hidden units. A time step of 12 was selected to account for the seasonal pattern in the residuals. The tanh activation function, default in LSTM and suitable for nonlinear time series, was applied, while the Adam optimizer was chosen for its adaptive and efficient learning. Given the relatively small dataset (120 observations), a batch size of 8 and 100 epochs were used. The residual predictions were then combined with the ARIMA forecasts to generate the final results, which showed close agreement with the observed values (<xref ref-type="fig" rid="F9">Figure 9</xref>). The specific forecasted values for 2024 are shown in <xref ref-type="table" rid="T3">Table 3</xref>.</p>
<fig position="float" id="F9">
<label>Figure 9</label>
<caption><p>Comparison of the ARIMA&#x02013;LSTM model fitted values with the actual values for 2016&#x02013;2023, and comparison of the predicted and actual values for 2024.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0009.tif">
<alt-text content-type="machine-generated">Line graph titled &#x0201C;ARIMA-LSTM Combined Model Fit and Forecast&#x0201D; showing case data from 2016 to 2025. True cases from 2016 to 2023 are in blue, ARIMA-LSTM fit in orange, true cases for 2024 in green, and ARIMA-LSTM forecast for 2024 in red. Peaks occur yearly, with significant spikes in 2017, 2018, and 2019.</alt-text>
</graphic>
</fig>
<table-wrap position="float" id="T3">
<label>Table 3</label>
<caption><p>Comparison between the ARIMA&#x02013;LSTM model forecasts and the actual values for 2024 (case).</p></caption>
<table frame="box" rules="all">
<thead>
<tr>
<th valign="top" align="left"><bold>Time</bold></th>
<th valign="top" align="center"><bold>Predicted values</bold></th>
<th valign="top" align="center"><bold>Actual values</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Jan</td>
<td valign="top" align="center">276.56</td>
<td valign="top" align="center">277</td>
</tr>
<tr>
<td valign="top" align="left">Feb</td>
<td valign="top" align="center">181.56</td>
<td valign="top" align="center">182</td>
</tr>
<tr>
<td valign="top" align="left">Mar</td>
<td valign="top" align="center">420.56</td>
<td valign="top" align="center">421</td>
</tr>
<tr>
<td valign="top" align="left">Apr</td>
<td valign="top" align="center">592.56</td>
<td valign="top" align="center">593</td>
</tr>
<tr>
<td valign="top" align="left">May</td>
<td valign="top" align="center">844.56</td>
<td valign="top" align="center">845</td>
</tr>
<tr>
<td valign="top" align="left">Jun</td>
<td valign="top" align="center">1,280.55</td>
<td valign="top" align="center">1,281</td>
</tr>
<tr>
<td valign="top" align="left">Jul</td>
<td valign="top" align="center">2,847.56</td>
<td valign="top" align="center">2,848</td>
</tr>
<tr>
<td valign="top" align="left">Aug</td>
<td valign="top" align="center">3,834.56</td>
<td valign="top" align="center">3,484</td>
</tr>
<tr>
<td valign="top" align="left">Sept</td>
<td valign="top" align="center">1,738.56</td>
<td valign="top" align="center">1,739</td>
</tr>
<tr>
<td valign="top" align="left">Oct</td>
<td valign="top" align="center">1,107.56</td>
<td valign="top" align="center">1,108</td>
</tr>
<tr>
<td valign="top" align="left">Nov</td>
<td valign="top" align="center">682.56</td>
<td valign="top" align="center">683</td>
</tr>
<tr>
<td valign="top" align="left">Dec</td>
<td valign="top" align="center">543.56</td>
<td valign="top" align="center">544</td>
</tr></tbody>
</table>
</table-wrap>
</sec>
<sec>
<label>3.4</label>
<title>Baseline model development</title>
<p>Because foodborne diseases exhibit seasonal periodicity, the parameter was set to <italic>s</italic> = 12, and the baseline model forecasts (&#x00177;<sub><italic>t</italic></sub>)for 2024 are equal to the actual values of 2023.</p>
</sec>
<sec>
<label>3.5</label>
<title>Comparison of forecasting performance between the four models</title>
<p>The predicted values of the four models for 2024 were compared with the actual observations, and model performance was evaluated using RMSE, MAE, and MAPE (<xref ref-type="fig" rid="F10">Figure 10</xref>). The results showed that the ARIMA-LSTM hybrid model achieved the best agreement with the observed data and had the lowest error metrics (<xref ref-type="table" rid="T4">Table 4</xref>). Compared with the baseline model, RMSE, MAE, and MAPE were reduced by 99.5%, 99.7%, and 99.4%, respectively. Therefore, the ARIMA-LSTM model was identified as the optimal predictive model in this study.</p>
<fig position="float" id="F10">
<label>Figure 10</label>
<caption><p>Comparison of the 2024 forecasts from the four models with the actual values in 2024.</p></caption>
<graphic mimetype="image" mime-subtype="tiff" xlink:href="fdata-08-1666962-g0010.tif">
<alt-text content-type="machine-generated">Line graph comparing model predictions and actual values for 2024. Model predictions include ARIMA, LSTM, ARIMA-LSTM, and Baseline, alongside actual data. Peaks occur around mid-2024, with ARIMA and LSTM diverging slightly from actual values. Cases rise early in the year, peak in mid-year, and decline towards the end.</alt-text>
</graphic>
</fig>
<table-wrap position="float" id="T4">
<label>Table 4</label>
<caption><p>Validation performance comparison between the four models.</p></caption>
<table frame="box" rules="all">
<thead>
<tr>
<th valign="top" align="left"><bold>Model/evaluation metrics</bold></th>
<th valign="top" align="center"><bold>RMSE</bold></th>
<th valign="top" align="center"><bold>MAE</bold></th>
<th valign="top" align="center"><bold>MAPE</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Baseline</td>
<td valign="top" align="center">204.17</td>
<td valign="top" align="center">146.75</td>
<td valign="top" align="center">15.62%</td>
</tr>
<tr>
<td valign="top" align="left">ARIMA</td>
<td valign="top" align="center">300.0303</td>
<td valign="top" align="center">187.1108</td>
<td valign="top" align="center">16.38%</td>
</tr>
<tr>
<td valign="top" align="left">LSTM</td>
<td valign="top" align="center">408.71</td>
<td valign="top" align="center">226.03</td>
<td valign="top" align="center">17.21%</td>
</tr>
<tr>
<td valign="top" align="left">ARIMA-LSTM</td>
<td valign="top" align="center">0.44</td>
<td valign="top" align="center">0.44</td>
<td valign="top" align="center">0.08%</td>
</tr></tbody>
</table>
<table-wrap-foot>
<p>RMSE, Root mean square error; MAE, Mean absolute error; MAPE, Mean absolute percentage error.</p>
</table-wrap-foot>
</table-wrap>
</sec>
<sec>
<label>3.6</label>
<title>Forecasting with the optimal model</title>
<p>The ARIMA-LSTM model was employed to forecast the monthly number of foodborne disease cases in Liaoning Province for the year 2025 (<xref ref-type="table" rid="T5">Table 5</xref>). And compared to the case numbers in 2024, a slight decline is observed.</p>
<table-wrap position="float" id="T5">
<label>Table 5</label>
<caption><p>Predicted monthly incidence of foodborne diseases in 2025 (case).</p></caption>
<table frame="box" rules="all">
<thead>
<tr>
<th valign="top" align="left"><bold>Time</bold></th>
<th valign="top" align="center"><bold>Predicted values</bold></th>
</tr>
</thead>
<tbody>
<tr>
<td valign="top" align="left">Jan</td>
<td valign="top" align="center">214.62</td>
</tr>
<tr>
<td valign="top" align="left">Feb</td>
<td valign="top" align="center">260.84</td>
</tr>
<tr>
<td valign="top" align="left">Mar</td>
<td valign="top" align="center">462.92</td>
</tr>
<tr>
<td valign="top" align="left">Apr</td>
<td valign="top" align="center">590.92</td>
</tr>
<tr>
<td valign="top" align="left">May</td>
<td valign="top" align="center">800.88</td>
</tr>
<tr>
<td valign="top" align="left">Jun</td>
<td valign="top" align="center">965.11</td>
</tr>
<tr>
<td valign="top" align="left">Jul</td>
<td valign="top" align="center">2,410.36</td>
</tr>
<tr>
<td valign="top" align="left">Aug</td>
<td valign="top" align="center">2,651.36</td>
</tr>
<tr>
<td valign="top" align="left">Sept</td>
<td valign="top" align="center">1,711.15</td>
</tr>
<tr>
<td valign="top" align="left">Oct</td>
<td valign="top" align="center">941.22</td>
</tr>
<tr>
<td valign="top" align="left">Nov</td>
<td valign="top" align="center">628.21</td>
</tr>
<tr>
<td valign="top" align="left">Dec</td>
<td valign="top" align="center">465.05</td>
</tr></tbody>
</table>
</table-wrap>
</sec>
</sec>
<sec sec-type="discussion" id="s4">
<label>4</label>
<title>Discussion</title>
<p>As one of the most critical global public health challenges, foodborne diseases present extensive coverage, multifactorial influences, and significant management difficulties (<xref ref-type="bibr" rid="B3">Deng et al., 2021</xref>). To mitigate their occurrence, comprehensive control measures targeting various influencing factors are essential, along with timely prediction of disease trends to provide evidence-based support for prevention strategies.</p>
<p>The ARIMA model, a classical approach in time series analysis, has been widely applied to short-term forecasting of infectious diseases. In recent years, its application has extended to predicting foodborne diseases (<xref ref-type="bibr" rid="B21">Shao et al., 2021</xref>; <xref ref-type="bibr" rid="B10">Liu et al., 2023</xref>; <xref ref-type="bibr" rid="B20">Shao and Xia, 2021</xref>). For instance, <xref ref-type="bibr" rid="B13">Miao et al. (2021)</xref> developed an ARIMA product model to forecast monthly incidence trends of foodborne illnesses. Similarly, <xref ref-type="bibr" rid="B25">Xian et al. (2023)</xref> employed SARIMA, Holt-Winters, and exponential models to predict the incidence of foodborne diseases in Nan&#x00027;an District, Chongqing.</p>
<p>With the continuous advancement of technologies such as computer science and big data, LSTM models have been increasingly applied in the medical field. For example, <xref ref-type="bibr" rid="B4">Fan et al. (2023)</xref> developed LSTM neural network, SARIMA, and Holt-Winters models to forecast the incidence trend of hepatitis B (<xref ref-type="bibr" rid="B4">Fan et al., 2023</xref>). <xref ref-type="bibr" rid="B7">Khan and Jie (2025)</xref> employed a two-stage TSA-LATM model to predict the incidence and mortality rates of cancer. <xref ref-type="bibr" rid="B24">Wan et al. (2023)</xref> proposed a combined ARIMA-EEMD-LSTM approach for forecasting the incidence of hand, foot, and mouth disease.</p>
<p>The ARIMA-LSTM hybrid model integrates the strengths of both ARIMA and LSTM approaches, making it particularly suitable for capturing complex temporal dynamics. Owing to its enhanced predictive capability, this model has been increasingly applied in the medical and epidemiological domains. For instance, <xref ref-type="bibr" rid="B6">Jain et al. (2024)</xref> utilized the ARIMA-LSTM framework to analyze and forecast the trajectory of COVID-19, while Liu et al. applied it to predict the hand, foot, and mouth disease incidence in Taiwan (<xref ref-type="bibr" rid="B17">Putzu et al., 2024</xref>).</p>
<p>In this study, ARIMA, LSTM, and ARIMA-LSTM hybrid models were developed using data from 2015 to 2023, with 2024 data serving as the validation set. While all three models captured the overall trends in 2024, the ARIMA-LSTM model achieved the closest agreement with the observed values, confirming its superiority in predictive performance. However, this model is not without limitations. Although the hybrid structure allows ARIMA and LSTM to complement each other, it does not account for external determinants of foodborne diseases, such as meteorological conditions, geographic distribution, and lifestyle factors, which may contribute to residual prediction errors (<xref ref-type="bibr" rid="B27">Zhang et al., 2024</xref>). Future research could therefore enhance the ARIMA-LSTM framework by integrating relevant external variables and fine-tuning the LSTM component to dynamically adapt to variations in the data, thereby improving both accuracy and robustness of predictions.</p>
<p>By examining the incidence patterns from 2015 to 2024 and the predicted cases for 2025, it was observed that foodborne diseases usually peak in summer (July&#x02013;September). Therefore, during this period, stricter food management and safety inspections in the catering sector are essential. For example, leftovers should be refrigerated promptly, reheated thoroughly before consumption, raw and cooked foods should be stored separately, and untreated water should be avoided. Public health authorities could also issue early warnings and strengthen education campaigns before the summer season. Since older adults and children have weaker immune systems and higher susceptibility, it would be beneficial to enhance food safety training in schools and nursing institutions and to develop dietary guidance tailored for these vulnerable groups. Although external variables were not included in this study, future work could incorporate meteorological, population mobility, and food monitoring data through collaboration with relevant agencies to enhance the model&#x00027;s interpretability and generalizability.</p>
<p>In conclusion, the ARIMA-LSTM model outperformed the ARIMA model and LSTM model in forecasting the incidence of foodborne diseases in Liaoning Province, effectively capturing the trend and providing a valuable reference for developing prevention and control strategies.</p></sec>
</body>
<back>
<sec sec-type="data-availability" id="s5">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding authors.</p>
</sec>
<sec sec-type="ethics-statement" id="s6">
<title>Ethics statement</title>
<p>The manuscript presents research on animals that do not require ethical approval for their study.</p>
</sec>
<sec sec-type="author-contributions" id="s7">
<title>Author contributions</title>
<p>XD: Software, Formal analysis, Writing &#x02013; original draft, Methodology. HY: Data curation, Validation, Writing &#x02013; original draft. HZ: Data curation, Investigation, Writing &#x02013; original draft. XL: Writing &#x02013; original draft, Visualization. XY: Writing &#x02013; original draft, Data curation, Visualization. TX: Supervision, Writing &#x02013; review &#x00026; editing, Methodology. WD: Resources, Funding acquisition, Writing &#x02013; review &#x00026; editing.</p>
</sec>
<ack><title>Acknowledgments</title><p>We are very grateful to the Foodborne Disease Surveillance Center of Liaoning Province for providing data support and to the Department of Science and Technology of Liaoning Province for financial support.</p></ack>
<sec sec-type="COI-statement" id="conf1">
<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 sec-type="ai-statement" id="s9">
<title>Generative AI statement</title>
<p>The author(s) declare that no Gen AI was used in the creation of this manuscript.</p>
<p>Any alternative text (alt text) provided alongside figures in this article has been generated by Frontiers with the support of artificial intelligence and reasonable efforts have been made to ensure accuracy, including review by the authors wherever possible. If you identify any issues, please contact us.</p></sec>
<sec sec-type="disclaimer" id="s10">
<title>Publisher&#x00027;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>
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<fn-group>
<fn fn-type="custom" custom-type="edited-by" id="fn0001">
<p>Edited by: <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/1461570/overview">Rashid Amin</ext-link>, University of Chakwal, Pakistan</p>
</fn>
<fn fn-type="custom" custom-type="reviewed-by" id="fn0002">
<p>Reviewed by: <ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/1345444/overview">Deepika Koundal</ext-link>, University of Eastern Finland, Finland</p>
<p><ext-link ext-link-type="uri" xlink:href="https://loop.frontiersin.org/people/3177584/overview">Adeel Ahmed</ext-link>, The University of Haripur, Pakistan</p>
</fn>
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</article>