Table 1.
Descriptive statistics
| Full | Children | Adolescents | Young adults | |
|---|---|---|---|---|
| N | 555 | 137 | 297 | 121 |
| Age (sd) | 14.360 (3.394) | 9.672 (1.058) | 14.790 (1.710) | 18.640 (.837) |
| Biological sex (# female/percentage) | 272 (49.100%) | 64 (46.715%) | 138 (46.464%) | 70 (57.851%) |
| ADHD total symptoms (sd) | 2.223 (2.891) | 2.489 (3.080) | 2.037 (2.883) | 2.380 (2.675) |
| ADHD inattention symptoms (sd) | 1.634 (2.173) | 1.759 (2.235) | 1.562 (2.249) | 1.669 (1.908) |
| ADHD hyperactivity/impulsivity symptoms (sd) | .589 (.967) | .729 (1.068) | .475 (.893) | .711 (.995) |
| Brain regions (volume) | ||||
| Angular gyrus, standardized (sd) | − .010 (.867) | .458 (.872) | − .049 (.803) | − .044 (.754) |
| Caudate, standardized (sd) | − .011 (.975) | .302 (.935) | − .068 (.987) | − .227 (.909) |
| Cingulate gyrus, standardized (sd) | − .013 (.988) | .469 (.874) | − .044 (.984) | − .485 (.872) |
| DLPFC, standardized (sd) | − .015 (.983) | .547 (.934) | − .073 (.934) | − .511 (.906) |
| Inferior temporal lobe, standardized (sd) | − .008 (.996) | .328 (.890) | .022 (.947) | − .460 (1.062) |
| Total intracranial volume, mm3 (sd) | 1413671 (143764.2) | 1417708 (114153.5) | 1421687 (146137.3) | 1389422 (164925.8) |