Incidence (IR) of treated attention deficit disorder by age for males aged 5–14 years (1996–2001).
| Age (years) | Number of cases | Person-years | IR × 10−3 (95% CI) |
|---|---|---|---|
| 5–6 | 71 | 72282 | 1.0 (0.8 to 1.2) |
| 7–8 | 113 | 72995 | 1.5 (1.3 to 1.9) |
| 9–10 | 119 | 67089 | 1.8 (1.5 to 2.1) |
| 11–12 | 95 | 62385 | 1.5 (1.2 to 1.9) |
| 13–14 | 59 | 60187 | 1.0 (0.7 to 1.3) |