Intervention Use
Intervention use and retention or adherence were assessed using web-based data internally collected within the Aim2Be app for parents and adolescents. Intervention use was evaluated using the following indicators: (1) the proportion of participants who downloaded and used the app, (2) total time (in minutes) spent in the app over 3 months, (3) weekly proportion of participants who accessed the app and weekly mean minutes spent on the app over 3 months, and (4) the proportion of participants who used an app feature at least once over 1 month. These analyses included the whole sample, from both the Aim2Be intervention and waitlist control groups (who accessed the app from 3 to 6 months). These measures were computed separately for parents, preteens, and teens because a slightly different app version was developed for preteens [