Multiplicative interactions between maternal smoking during pregnancy and maternal age for the period of stable SIDS rate; 1993–1998
| Smoking | Age under 25 | SIDS No (%) | Controls No (%) | Odds ratio (95% CI) |
|---|---|---|---|---|
| Yes | Yes | 14 (38) | 4 (5) | 35.95 (5.60 to 230.60) |
| Yes | No | 7 (19) | 19 (24) | 2.61 (0.73 to 9.33) |
| No | Yes | 6 (16) | 9 (11) | 7.02 (1.36 to 36.40) |
| No | No | 10 (27) | 48 (60) | 1.0 (ref) |
p value for interaction = 0.01.