and divergent validity (Achenbach, 1991a, 1991c). Separate mother and teacher externalizing symptom sum scores for each age were used in longitudinal linear mixed modeling analyses (described below). Alphas across years ranged from .88 to .92 for mother reports and .95 to .96 for teacher reports1. CBCL data were available for 85–95% (M = 89%) of the sample at each time point, and 34, 39, 25, 32, 34, and 23 of the participants’ scores were in the clinical range at ages 12–17, respectively. TRF data were available for 85% and 81% of the sample at ages 12 and 13, and 25 and 24 of participants’ scores were in the clinical range.
