Sex differences in ADHD symptom severity.

  title={Sex differences in ADHD symptom severity.},
  author={Anne B Arnett and Bruce F. Pennington and Erik G Willcutt and John C Defries and Richard K. Olson},
  journal={Journal of child psychology and psychiatry, and allied disciplines},
  volume={56 6},
BACKGROUND Males show higher rates of attention deficit hyperactivity disorder (ADHD) than do females. Potential explanations include genuine etiological differences or artifact. METHODS 2,332 twin and sibling youth participated in behavioral and cognitive testing. Partially competing models of symptom severity distribution differences, the mean difference, and variance difference models, were tested within a randomly selected subsample. The Delta method was used to test for mediation of sex… CONTINUE READING