Table 1.
Demographic and clinical variables for typically developing children, ADHD patients, and the pooled sample
| All sites | KKI | NYU | PU | |||||
|---|---|---|---|---|---|---|---|---|
| N | 300 | 46 | 132 | 122 | ||||
| TDC | 145 | 34 | 45 | 66 | ||||
| ADHD | 155 | 12 | 87 | 56 | ||||
| Age | 11.7 | 2.4 | 10.4 | 1.4 | 11.7 | 2.9 | 12.3 | 1.8 |
| TDC | 11.8 | 2.3 | 10.3 | 1.4 | 12.3 | 3.2 | 12.1 | 1.7 |
| ADHD | 11.7 | 2.5 | 10.4 | 1.5 | 11.4 | 2.7 | 12.4 | 2.0 |
| IQ | 112.7 | 15.2 | 113.0 | 13.8 | 109.3 | 14.6 | 116.1 | 15.6 |
| TDC | 117.4 | 13.6 | 115.3 | 13.0 | 113.5 | 13.6 | 121.1 | 13.2 |
| ADHD | 108.4 | 15.2 | 106.5 | 14.5 | 107.3 | 14.6 | 110.4 | 16.3 |
| Inattention score | 43.9 | 21.4 | 51.2 | 11.0 | 60.8 | 13.6 | 21.7 | 7.4 |
| TDC | 33.5 | 15.7 | 45.4 | 5.3 | 45.0 | 7.2 | 15.4 | 3.6 |
| ADHD | 57.3 | 21.5 | 66.7 | 6.0 | 68.7 | 8.0 | 28.3 | 3.6 |
| Impulsivity score | 42.2 | 23.0 | 52.8 | 11.4 | 60.1 | 14.2 | 17.7 | 7.0 |
| TDC | 31.7 | 16.9 | 47.0 | 4.6 | 45.3 | 4.6 | 13.1 | 3.5 |
| ADHD | 51.2 | 23.8 | 68.2 | 9.9 | 67.4 | 11.3 | 22.4 | 6.6 |
Mean and standard deviation (italics) are provided for each continuous measure. N, number; IQ, intelligence quotient; ADHD, attention‐deficit/hyperactivity disorder; TDC, typically developing children; KKI, Kennedy Krieger Institute; NYU, New York University; and PU, Peking University.