Table 1. .
Demographic and clinical characteristics of the participants
| Characteristics | ADHD (N = 40) | NT (N = 36) | Test statistic (df) | p |
|---|---|---|---|---|
| Age, M (SD) | 28.35 (5.13) | 28.42 (7.81) | t (59.38) = 0.043 | .97 |
| Gender, male/female | 17/23 | 14/22 | χ2 (1) = 0.10 | .75 |
| Handedness, right/left | 34/6 | 33/3 | χ2 (1) = 0.81 | .37 |
| General cognitive abilities | ||||
| Vocabulary, M (SD) | 11.38 (2.54) | 11.11 (2.44) | t (74) = −0.46 | .65 |
| Matrix reasoning, M (SD) | 12.43 (2.82) | 13.17 (2.22) | t (74) = 1.26 | .21 |
| Education* | 6/11/7/1/5/5 | 3/12/2/1/5/9 | χ2 (5) = 4.84 | .44 |
| Mood, M (SD) | 5.15 (3.42) | 5.00 (3.67) | t (73) = −0.18 | .86 |
| Alcohol consumption, M (SD) | 4.30 (2.39) | 3.57 (2.03) | t (73) = −1.41 | .16 |
| ADHD symptoms (ASRS) | ||||
| Inattention, M (SD) | 23.36 (5.08) | 12.78 (5.54) | t (74) = −8.69 | < .001 |
| Hyperactivity-impulsivity, M (SD) | 19.58 (7.27) | 10.19 (4.96) | t (69.15) = −6.63 | < .001 |
| CPT errors (CPT-2) | ||||
| Omission errors, Mdn (IQR) | 1 (0–3) | 1 (0–1) | U = 670 | .59 |
| Commission errors, M (SD) | 17.77 (7.01) | 10.22 (5.48) | t (74) = −5.19 | < .001 |
Note. df = degrees of freedom, M = mean, SD = standard deviation, ASRS = Adult ADHD Self-Report Scale, CPT-2 = Conners Continuous Performance Test 2 Mdn = median, IQR = interquartile range.
*
Education scale in order of appearance: comprehensive school/upper secondary school/vocational school/community college level/bachelor’s degree/master’s degree.