terms of the relationships among the observed variables. Although the genetic correlation between behavioral disinhibition and response inhibition was higher for the attention problems model (rA = −.71) than for the hyperactivity/impulsivity model (rA = −.46), the heritability estimates of the latent behavioral disinhibition factor were nearly identical in the model including the attention problems subscale and the model including the hyperactivity/impulsivity subscale (a2s = .43 and .45, respectively) at age 17. These results suggest that both the attention problems and hyperactivity/impulsivity components of ADHD are involved in behavioral disinhibition at both age 12 and age 17 and are genetically related to response inhibition.
