individuals with complete data for at least one of waves 2–5. Of 927 initial cases, 72 cases (7.77%) were excluded because of missing data at any wave. Of the total sample 86% completed two or more of these waves. To assess the relationship between predictor/outcomes on attrition, bivariate poisson regressions were conducted on the count of completed waves for each predictor and for alcohol use. Participants who lived with both parents at wave 2 completed significantly more waves than participants with other living arrangements (see Measures) (Boys: β = −.2, p < .01; Girls: β = −.16, p < .05). There were no other significant associations with the number of waves completed. Compared to Wave 1, the retention rates were 98.2, 96.9, 84.6, and 88.0% for Waves 2–5 respectively.
