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From the extended-cosine models, we extracted measures of 24-hour robustness (pseudo-F statistic, indicating how well the observed data fits the 24-hour curve); activity onset time (up-mesor, the time which the modeled activity level passes the middle modeled rhythm height prior to the peak); and activity offset time (down-mesor or the time which the modeled activity level passes the middle modeled rhythm height prior to the nadir).
JMIR Aging 2025;8:e67294
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Adolescents (male/female [M/F]) meeting the criteria in the selected households, were also surveyed after a random draw if numerous. If the number of households expected to be surveyed was greater than the number of households in the selected cluster, another cluster was randomly selected to complete the total number of samples required for the survey.
JMIR Res Protoc 2025;14:e64796
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Adolescent Cyberbullying and Cyber Victimization: Longitudinal Study Before and During COVID-19
Once fitted, a selection of variables was performed by removing the nonsignificant ones according to ANOVA F tests. These results are given in Tables S1 and S2 in Multimedia Appendix 1. Missing data cases were discarded. Cases were fixed based on the most complete model before the model selection. For the analysis, complete cases for the selected model’s features were used.
The victimization and perpetration model coefficients are given in Tables S3 and S4 in Multimedia Appendix 1.
J Med Internet Res 2025;27:e70508
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