behavior, 15.2% of individuals carrying 1 copy of the minor allele displayed elevated persistent externalizing behavior, and 21.1% of individuals carrying 2 copies of the minor allele displayed elevated persistent externalizing behavior. Corresponding odds ratios ranged from 2.1 to 2.7 (all P≤.001). A parallel analysis with trajectory class membership regressed on parental monitoring yielded no evidence of a main effect of parental monitoring (P=.44).
