Table 1

Demographic and clinical characteristics of study participants

Group; mean ± SD (range)*
CharacteristicADHD, n = 307Unaffected siblings, n = 169Controls, n = 196
Age, yr17.06 ± 3.42 (8–26)17.52 ± 4.11 (8–30)16.66 ± 3.07 (9–24)
Male sex, %†684349
ADHD symptoms13.16 ± 2.991.17 ± 2.200.76 ± 1.90
IQ†97.08 ± 15.18102.19 ± 14.54106.61 ± 13.70
Site distribution, site1:site 2130:17778:91120:76
Medication use, ever:never272:35——
No. of scans used, 1:239:26811:1585:191

  • ADHD = attention-deficit/hyperactivity disorder; SD = standard deviation.

  • ↵* Unless indicated otherwise.

  • ↵† Differed significantly between participants with ADHD and controls.