Participants (n=1023) were recruited from six local middle schools. Study information and informed parental consent forms was distributed by faculty and were also mailed to each student’s home based on the school roster. Incentives were provided to students to return a signed consent form regardless of whether consent to participate in the study was granted. Across the schools, 39% (1,778/4,582) of students returned a consent form, 65% (1,156/1,778) of the forms returned were consents allowing for participation, and 88% (1,023/1,156) of these individuals were enrolled into the study. Interested youth from whom we had written parental consent attended a two-hour in-person group orientation and completed a 45-minute computerized baseline survey (Wave 1). Participants were assessed over a three-year period, with a total of five semi-annual web-surveys across two years and a follow-up web-survey one year later. Multiple alerts and reminders (via mail, email, text, and phone) indicated when a survey was available. Participants received $25 for the baseline survey and a $20 gift card for each follow-up survey. Response rates were 92% at Wave 2, 88% at Wave 3, 85%
