The effect of an older sibling on the risk of injury, by age at time of injury
| Age (years) | No (%) with no older sibling | No (%) with older sibling | Adjusted odds ratio* (95% CI) |
|---|---|---|---|
| *Adjusted for maternal age. | |||
| All (n=3145) | 1072 (34) | 2073 (66) | 1.50 (1.37 to 1.65) |
| 0–2 (n=2411) | 816 (34) | 1595 (66) | 1.56 (1.41 to 1.73) |
| 3–4 (n=556) | 194 (35) | 362 (65) | 1.35 (1.11 to 1.63) |
| >4 (n=178) | 62 (35) | 116 (65) | 1.28 (0.92 to 1.78) |