Recruitment and Retention Procedures
Girls were recruited and enrolled between January 23, 2017, and January 12, 2018. Participants were recruited primarily through Facebook and Instagram. Advertisements targeted users with profiles who indicated they were female, between 14 and 18 years of age, and “interested in females” or “interested in males and females.”Interested youth clicked on the advertisement, which linked them to the online eligibility screening form. Girls who appeared to be eligible were contacted sequentially via the telephone to confirm eligibility and fully discuss study risks, given the waiver of parental permission. Youth living in rural settings or identifying as racial/ethnic minority were given preference to ensure a demographically diverse sample.Randomization. After completing the baseline survey, girls were randomized to treatment (Data Collection. Surveys were collected online and via text messaging. Girls completed assessments at baseline; 7 weeks later; intervention end, 5 months later; and 3-, 6-, 9-, and 12-month post-intervention end. Data at 6-, 9-, and 12-month post-intervention end are analyzed in the current investigation.Incentive. Youth were not incentivized to complete the baseline survey, but were incentivized to complete follow-up surveys. Youth were asked to complete both online (longer) and text messaging (shorter) surveys. The former were incentivized at a higher rate to reflect the greater burden. Incentives also generally increased over time to attend to potential waning of interest in continued participation. Due to funding uncertainties mid-way through the RCT (Kay, 