Birthweight specific SIDS mortality rates in like and unlike sex pairs
| Like sex | Unlike sex | ||||||
|---|---|---|---|---|---|---|---|
| Birthweight group | No. SIDS | No. live births | SIDS mortality rate | No. SIDS | No. live births | SIDS mortality rate | Relative risk like/unlike sex (95% CI) |
| *Includes 948 birth weight not stated. | |||||||
| †Includes 444 birth weight not stated. | |||||||
| ‡Mantel-Haenszel weighted relative risk. | |||||||
| <1500 g | 15 | 6443 | 2.33 | 1 | 2548 | 0.39 | 5.93 (0.78 to 44.89) NS |
| 1500–2499 g | 40 | 29832 | 1.34 | 19 | 13702 | 1.39 | 0.97 (0.56 to 1.67) NS |
| 2500–2999 g | 15 | 21913 | 0.68 | 9 | 11633 | 0.77 | 0.88 (0.39 to 2.02) NS |
| ≥3000 g | 7 | 8927 | 0.78 | 9 | 4389 | 2.05 | 0.38 (0.14 to 1.03) NS |
| All | 77 | 68063* | 1.13 | 38 | 33716† | 1.13 | 1.16‡ (0.78 to 1.78) NS |