The effect of an older sibling on the risk of injury, by number of older siblings
| No of older siblings | No (%) with no injury | No (%) with injury | Adjusted odds ratio* (95% CI) |
|---|---|---|---|
| *Adjusted for maternal age. | |||
| †p<0.01, score test for trend of odds. | |||
| None (n=4589) | 3517 (77) | 1072 (23) | 1.0 |
| 1 (n=3785) | 2709 (72) | 1076 (28) | 1.39 (1.26 to 1.54)† |
| 2 (n=1979) | 1359 (69) | 620 (31) | 1.63 (1.44 to 1.85)† |
| ≥3 (n=1163) | 786 (68) | 377 (32) | 1.69 (1.44 to 1.97)† |