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Table 1 Basic demographic and clinical characteristics of the study samplea

From: Impaired early information processing in adult ADHD: a high-density ERP study

Characteristics Control (N = 25) ADHD (N = 26) Chi2 P
Male, N (%) 19 (76.0) 18 (69.2) 0.29 0.76
Medication
 Methylphenidate, N (%) 9 (34.6) n/a n/a
 Antidepressant, N (%) 2 (7.69) n/a n/a
 Anxiolytic, N (%) 1 (3.85) n/a n/a
Comorbidity
 Depressive disorder, N (%) 4 (15.38) n/a n/a
 Anxiety disorder, N (%) 4 (15.38) n/a n/a
 Both, N (%) 3 (11.54) n/a n/a
    F P
Mean age, mean (SD) 27.3 (5.0) 28.9 (8.4) 0.71 0.40
Years of education, mean (SD) 16.3 (1.6) 14.0 (2.5) 13.94 0.0005
CAARSb
 Inattention, mean (SD) 11.1 (7.9) 23.7 (7.0) 32.09 < 0.0001
 Hyperactivity, mean (SD) 10.1 (6.3) 20.1 (4.8) 36.74 < 0.0001
 Impulsivity, mean (SD) 9.1 (6.5) 17.6 (7.4) 16.98 0.0002
 Problems with Self Concept (SD) 4.8 (4.4) 10.1 (5.5) 12.92 0.0008
SCL-90Rc, mean (SD) 33.1 (30.1) 86.3 (51.3) 16.48 0.0002
Behavioural measures
 Commission errors, %, mean (95% confidence limits) 3.04 (2.32–3.98) 8.85 (7.63–10.2) 46.33 < 0.0001
 Reaction time, msec, mean (95% confidence limits) 508.5 (480.12–538.55) 502.51 (475.27–531.31) 0.09 0.7670
  1. aChi-square test for categorical, Analysis of Variance for continuous variables. Generalized Linear Mixed Model (GLIMMIX) analysis was applied for the behavioural measures since this approach makes allowance for non-normally distributed data; mean and 95% confidence limits were estimated from the GLIMMIX model
  2. bCAARS = Conners’ Adult ADHD Rating Scales
  3. cSCL-90R = Symptom Checklist-90R