Gender and age by mean (confidence interval, CI) and median injury rate/2000 exposure hours (equivalent to one child year)
| Variable | No (%) | Mean injury rate (95% CI) | Median | Range |
|---|---|---|---|---|
| *t Statistic (df) = 1.93 (358), p = 0.05 (mean). | ||||
| Z statistic = −2.53, p = 0.01 (median). | ||||
| †t Statistic (df) = 2.47 (334), p = 0.01 (mean). | ||||
| Z statistic = 2.72, p = 0.01 (median). | ||||
| Gender* | ||||
| Boys | 197 (55) | 6.4 (6.0 to 6.8) | 4.5 | 0–38 |
| Girls | 163 (45) | 5.0 (4.6 to 5.3) | 3.0 | 0–47 |
| Age in years† | ||||
| 2.0–3.5 | 174 (48) | 6.8 (6.5 to 7.3) | 5.1 | 0–47 |
| 3.6–6.0 | 186 (52) | 4.5 (4.2 to 4.9) | 2.9 | 0–38 |
| Total | 360 (100) | 5.7 (5.4 to 6.0) | 3.8 | 0–47 |