Combined effect of infants small at birth and where the infant slept
| Where slept | Small at birth | SIDS | Controls | Univariate* | Multivariate† | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| n | (%) | n | (%) | OR (95% CI) | p value‡ | p value§ | OR (95% CI) | p value‡ | p value§ | ||
| *Adjusted for infant age in a conditional logistic regression model. | |||||||||||
| †Adjusted for infant age, birth centile, higher parity, parental unemployment, moving house more than once in the last year, young maternal age, any episode of lifelessness, and for the last sleep: change in usual routine, recent infant illness, lack of recent sleep, recent maternal alcohol consumption, sleeping position put down (side or prone), using a dummy, bedding and clothes higher than 10 tog, and found with head covered by bedding. | |||||||||||
| ‡p value relates to the significance of the combined effects odds ratio. | |||||||||||
| §p value relates to the interactions between co-sleeping in the parental bed × being small at birth and sleeping in a room outside the parental bedroom × being small at birth. | |||||||||||
| ¶Either found co-sleeping in the parental bed or found co-sleeping on a sofa or chair with at least one parent who usually smokes. | |||||||||||
| **Either found co-sleeping in the parental bed or found co-sleeping on a sofa or chair with parent or parents who do not smoke. | |||||||||||
| ††Infants who slept outside the parental room for night-time sleep or slept alone in a room for day-time sleeps. | |||||||||||
| By parents bed | No | 74 | (23.2) | 620 | (48.2) | 1.00 (ref group) | 1.00 (ref group) | ||||
| Co-sleeping with parents (smoke)¶ | No | 68 | (21.3) | 76 | (5.9) | 7.74 (4.79 to 12.51) | <0.0001 | 9.11 (4.12 to 20.22) | <0.0001 | ||
| Co-sleeping with parents (don’t smoke)** | No | 8 | (2.5) | 99 | (7.7) | 0.78 (0.35 to 1.76) | 0.55 | 1.12 (0.30 to 4.27) | 0.86 | ||
| Another room†† | No | 85 | (26.6) | 389 | (30.3) | 2.30 (1.52 to 3.46) | <0.0001 | 5.18 (2.59 to 10.38) | <0.0001 | ||
| By parents bed | Yes | 30 | (9.4) | 61 | (4.7) | 4.00 (2.29 to 6.99) | <0.0001 | 3.68 (1.44 to 9.39) | 0.006 | ||
| Co-sleeping with parents (smoke)¶ | Yes | 24 | (7.5) | 8 | (0.6) | 22.93 (8.37 to 62.80) | <0.0001 | 0.57 | 37.41 (5.83 to 239.86) | 0.0001 | 0.79 |
| Co-sleeping with parents (don’t smoke)** | Yes | 2 | (0.6) | 7 | (0.5) | 4.03 (0.74 to 22.0) | 0.11 | 0.75 | 15.18 (1.02 to 225.50) | 0.048 | 0.29 |
| Another room** | Yes | 28 | (8.8) | 25 | (1.9) | 9.30 (4.61 to 18.76) | <0.0001 | 0.88 | 79.45 (18.03 to 350.20) | <0.0001 | 0.047 |