- Have evidence of attention impairment based on parent report of attention deficit (> and = 75% on attention deficit hyperactivity disorder [ADHD] Index, Hyperactivity, or Cognitive-Problems/Inattention Index of parent-completed attention deficit hyperactivity disorder (ADHD) rating scale [Conners Parent Rating Scale] and perform at least 1.0 standard deviations below the mean on Omissions, Commissions, or Variability indexes of the Test of Variables of Attention (TOVA)