Model of the genetic (A), shared environmental (C), and non-shared environmental (E) overlap between externalizing psychopathology at age 41 and an externalizing factor at age 56 based on measures of aggression, constraint, current tobacco use, and current alcohol use. Variance explained by latent variables (ovals) can be computed by squaring these standardized factor loadings. Measured variables are displayed in rectangles. Significant factor loadings are displayed in bold with black lines (p < .05) and 95% standard error-based confidence intervals are displayed in brackets. This model fit the data well: χ2(285)=316.73, p=.102, RMSEA=.017, CFI=.990. ASPD = antisocial personality disorder, Cannabis = Cannabis use disorder, Alcohol = Alcohol use disorder, Tobacco = tobacco use disorder, MPQ Aggr = Multidimensional Personality Questionnaire – Aggression subscale, MPQ Constr = Multidimensional Personality Questionnaire – Constraint subscale.