Data were taken from an ongoing study on drinking initiation and progression (see Jackson et al., 2014; Jackson et al., 2015). Participants were 931 students who were enrolled into the study in 6th, 7th, and 8th grades (33%; 32%; 35%, respectively). The study sample is 52% female, 23% non-White (4% Black, 3% Asian, 2% American Indian, 7% mixed race, 6% other), and 11% Hispanic. Mean age at baseline was 12.2 years (range: 10–15, SD = 0.98). Based on school-level data (Information Works, 2009), the sample was largely representative of the schools from which they were drawn with respect to sex and grade, but was more racially diverse than the school populations but also less disadvantaged. At Wave 1, 6.3% of the sample (59/931) reported having consumed a full drink of alcohol.
