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 |