Table 2.
Background characteristics of the three symptom groups and controls identified and assessed at age 3½ years
| ANX (n = 175) | ADHD (n = 248) | ADHD and ANX (n = 123) | Controls (n = 82) | χ 2/F | Group comparisons, p | |
|---|---|---|---|---|---|---|
| Male (%) | 78 (45) | 140 (57) | 67 (55) | 42 (51) | 6.13 | ns |
| Age months, mean (SD) | 41.9 (1.4) | 41.7 (1.3) | 41.6 (1.2) | 41.6 (1.2) | 2.01 | ns |
| IQ, mean (SD) | 101.2 (9.6) | 100.8 (9.3) | 100.8 (8.6) | 103.0 (8.6) | 1.30 | ns |
Controls at age 3½ years are without symptoms of ADHD and anxiety. Age in months refers to time of clinical assessment
ANX anxiety symptoms, ADHD attention deficit/hyperactivity disorder symptoms, SD standard deviation, IQ intellectual ability