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Table 1 Participant characteristics

From: Behavioral sensitivity of Japanese children with and without ADHD to changing reinforcer availability: an experimental study using signal detection methodology

  Control ADHD
(n = 22) (n = 19)
Mean sd Range Mean sd Range
Age (months)a 122.73 20.48 86–149 107.74 14.78 89–137
Estimated IQ 98.00 12.29 84–121 104.47 14.91 77–126
Boys, n (%) 11 (50%) 19 (100%)
Stimulant medication (concerta), n 4
Subtype, n: inattentive/hyperactivity_impulsivity/combined 10/1/8
Comorbidity, n: oppositional defiant disorder   3
Language/Tic/asperger disorderb   1/1/2
  1. a The mean age was significantly higher for the control than ADHD group (t(39) = 2.65, p < .05)
  2. b Given that DSM-5 allows comorbid diagnosis of ASD with ADHD, children demonstrating symptoms of DSM-IV asperger disorder were included in the study if they satisfied other inclusion criteria. However, those demonstrating symptoms consistent with autistic disorder were excluded from the study due to accompanying cognitive impairments