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Article heterogeneity was determined using (1) the chi-square Q statistic, where P
We generated a funnel plot to examine the presence of publication bias in the included studies [44]. Statistical evaluation was performed using the Begg-Mazumdar rank correlation and Egger tests [45]. A P value of
The flowchart of study screening and selection is presented in Figure 1. The electronic database search yielded 6278 studies, from which we excluded 1285 duplicates.
J Med Internet Res 2025;27:e59002
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Nonbinary data were one-hot encoded, a method for rearranging categorical data into binary variables, and numerical data were normalized using min-max scaling. This would convert all numeric values between or equal to a value of 0 and 1. Min-max scaling is given by:
One-hot encoding, min-max scaling, and dataset splitting were accomplished using the Scikit-Learn library (version 0.24.2) [24]. These steps are required to improve the performance of machine learning models and training stability.
J Med Internet Res 2025;27:e62853
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To compare categorical data, we performed the chi-square test. The survival time was a continuous variable and was presented as the median (IQR). The Cox proportional hazards model was used to identify prognostic factors through both univariate and multivariate analyses. For the development of the RSF model, we used the random Forest SRC package, while the cph function was used to construct the Cox regression model.
J Med Internet Res 2025;27:e69864
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We used the chi-square test to calculate the P values when analyzing survey items that used single-choice or yes or no responses. All data analyses were performed using R (version 4.3.0; R Foundation for Statistical Computing).
This study was approved by the Institutional Review Board of Asan Medical Center, Korea (IRB 2021-1631), and adhered to relevant ethical guidelines.
J Med Internet Res 2025;27:e52694
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Differences among the intervention periods were analyzed using chi-square or Fisher exact tests. The Bonferroni method was applied to adjust for multiple comparisons. All statistical analyses were conducted using R software (version 4.1.0, R Foundation for Statistical Computing).
J Med Internet Res 2025;27:e59220
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Activities include weekly (30 min) online support groups, discussion polls, and campaign activities. Online support groups are live video meetings led by peer leaders and assisted by doctoral-level clinical psychology trainees at the I-Ca Re Training Center, who will be overseen by a licensed clinical psychologist and principal investigator (PI), under supervision from experts in health psychology and addiction medicine (SH and AHL).
JMIR Res Protoc 2025;14:e65847
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