School averages across each school’s participating waves are shown in Table 2. Number of participants varied by a factor of about 5 across the full range. Response rates were uniformly acceptable (about 80% or better; Huisman & Steglich, 2008). Percent non-White ethnicity varied across schools but all schools had a substantial number of non-White students. Network statistics and, especially, unsupervised time spent with peers varied somewhat across schools. Onset to first alcohol use was just below 30% for students entering sixth grade, rising to about 58% by the end of eighth grade, comparable to other studies of early adolescent drinking (Guttmannova et al., 2011).
