Pilot Study of a Multilevel Mobile Health App for Substance Use, Sexual Risk Behaviors, and Testing for Sexually Transmitted Infections and HIV Among Youth: Randomized Controlled Trial.

JMIR Mhealth Uhealth · 2020 · PMC7109616 · PMID 32181747

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marginally significantno p-value reported

Although chi-square testing (χ 2 2 =4.5; P =.10) suggests that these proportion differences between groups were marginally significant, the estimated proportion change effect size difference between groups (Cohen h =0.71) yielded a large effect size.

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