Table 2.
Demographic and Clinical Characteristics of subjects recruited.
| Gene-behavior association study | Imaging genetic study | |||||||
|---|---|---|---|---|---|---|---|---|
| ADHD (n = 1,040) | Control (n = 963) | χ2/t | P | ADHD (n = 35) | Control (n = 56) | χ2/t | P | |
| Male(%) | 876 (84.2%) | 607 (63) | 115.9 | <0.001 | 32 (91.4%) | 25 (44.6%) | 20.1 | <0.001 |
| Age [Mean (SD)] | 9.2 (2.5) | 15.0 (8.9) | 19.0 | <0.001 | 10.0 (1.7) | 9.8 (1.8) | 0.6 | 0.547 |
| IQ [Mean (SD)] | 103.9 (14.7) | 112.7 (14.1) | 9.3 | <0.001 | 106.2 (14.9) | 115.6 (12.7) | 3.2 | 0.002 |
| ADHD Subtype (%) | ||||||||
| ADHD-I | 360 (34.6%) | – | 14 (40%) | – | ||||
| ADHD-C | 680 (65.4%) | – | 21 (60%) | – | ||||
| Comorbidities (%) | ||||||||
| ADHD-comorbid | 746 (71.7%) | – | 26 (74.3%) | – | ||||
| ADHD-alone | 295 (28.3%) | – | 9 (25.7%) | – | ||||
ADHD, attention-deficit/hyperactivity disorder; ADHD-I, ADHD inattentive subtype; ADHD-C, ADHD combined subtype; ADHD-alone, ADHD subjects without any comorbidity; ADHD-comorbid, ADHD with assessed comorbidities; IQ, intelligence quotient; SD, standard deviation.