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Longitudinal biometric model fitted separately for the symptom count of each externalizing disorder. Longitudinal stability is modeled in terms of the stability of additive genetic (rA), shared environmental (rC), and nonshared environmental effects (rE). Subscripts refer to age of assessment in years. A = additive genetic variance component; C = shared environmental variance component; E = nonshared environmental variance component; AAB = adult antisocial behavior.
