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On the basis of previous comparable trials using the PG-13 as primary outcome [26,28,52], a moderate effect size of Cohen d=0.5 was considered to power the trial. Given a significance level of α=.05 and a statistical power of 1–β=.8, the optimal sample size to detect a moderate between-group effect at 4-month follow-up was calculated to be 128 (n=64, 50% per group). Considering a dropout rate of 25% based on previous trials [53,54], an initial sample size of 170 participants at baseline was aimed for.
J Med Internet Res 2025;27:e68662
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Race and Ethnicity in Facebook Images and Text: Thematic Analysis
JMIR Form Res 2025;9:e62713
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(D) Things not liked about the study.
This study examined adherence to a smartphone-based digital phenotyping protocol as part of a pilot study examining willingness to participate in an 8-day intensive measurement protocol to capture psychological well-being, health behaviors, and geolocation data among participants in the NHSII, a nationwide prospective cohort of women in the United States.
JMIR Mhealth Uhealth 2025;13:e71375
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