Teacher report of adolescent externalizing behavior at ages 12 to 14 was assessed using items from the aggression and delinquency subscales of the Teacher Report Form (TRF; Cronbach’s α = 0.94; Achenbach, 1991). Items are rated on a 3-point Likert scale (0 = not true to 2 = very true or often true). T-scores for the broad-band externalizing were used for the current study.
