Table 1.
Demographics and characteristics of the adult sample.
| Variable | Diagnosis group (#) | ||
|---|---|---|---|
| ADHD (167) | Unaffected siblings (47) | Controls (127) | |
| Age in yearsa | 25.44 ± 8.65 | 20.91 ± 2.08 | 29.68 ± 12.35 |
| Sex (male)b | 95 (57%) | 24 (51%) | 36 (28%) |
| Estimated IQa | 103.81 ± 16.48 | 103.60 ± 12.71 | 108.61 ± 15.36 |
| Inattentiona | 7.19 ± 1.74 | 1.72 ± 2.10 | 0.52 ± 1.18 |
| Hyperactivity-impulsivitya | 5.86 ± 2.37 | 1.51 ± 1.59 | 0.70 ± 1.00 |
| Forward digit span scorea | 8.89 ± 1.98 | 9.00 ± 1.74 | 9.59 ± 1.93 |
| Backward digit span scorea | 6.42 ± 2.31 | 5.96 ± 2.10 | 7.45 ± 2.04 |
| History of stimulantsb | 78 (47%) | 0 | 1 (0.8%) |
| Scan site (Nijmegen)b | 115 (69%) | 21 (45%) | 108 (85%) |
| Scan site (Amsterdam)b | 52 (31%) | 26 (55%) | 19 (15%) |
Note, aData represented as mean ± standard deviation.
bData is represented as a number (percentage).