Table 1. Demographic characteristic of patients with attention deficit hyperactivity disorder and control subjects.

Variables were expressed as mean±standard deviations, and numbers. ADHD: attention deficit hyperactivity disorder, SD: standard deviation, Hollingshead-Redlich 2/3/4: The Hollingshead and Redlich system defines occupational categories 0 (not working), 1, 2, 3, 4 (menial labor, unskilled labor; semiskilled labor, skilled labor), ODD: oppositional defiant disorder