Intervention Use
Among the 214 parents randomized to either the intervention or waitlist intervention groups, 190 (88.7%) were enrolled in the app. Most parents accessed the app via an iOS or Android system, but 1021 out of 4567 sessions (22% of all parent sessions) were accessed via a web-based (computer) platform. Among the 190 enrolled parents, 182 (96%) logged into the app for at least one session.Of the potential 99 preteens, 87 (88%) were enrolled in the app and among the 87 enrolled, 85 (98%) logged for at least 1 session in the app. Out of the potential 115 teens, 102 (89%) enrolled in the app, and among those 102 enrolled, 91 (89%) logged for at least one session in the app. Most adolescents accessed the app via an iOS or Android system, but 582 out of 4877 sessions (12% of all adolescent sessions) were accessed via a web-based platform.By week 2, the percentage of participants who used the app at least once had decreased to <60% for both preteens and parents and <50% for teens (