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. 1999 Dec 4;319(7223):1457–1462. doi: 10.1136/bmj.319.7223.1457

Table 5.

Multivariate model controlling for adverse bed sharing conditions. Figures are numbers (percentage) of infants unless stated otherwise

Details for infant* Infants who died (n=312) Controls (n=1295) Multivariate odds ratio (95% CI) P value
Solitary sleeper 111 (35.6) 419 (32.4) 1.96 (1.31 to 2.93) 0.001
Bed sharer (put back in cot) 24 (7.7) 178 (13.7) 0.60 (0.33 to 1.08) 0.09
Bed sharer (at end of sleep)  79 (25.3) 186 (14.4) 1.35 (0.83 to 2.20) 0.23
Sofa sharer 20 (6.4)  6 (0.5) 25.86 (6.72 to 99.47) <0.0001
Parental tiredness  86 (27.6) 191 (14.7) 2.42 (1.61 to 3.63) <0.0001
Maternal alcohol consumption  37 (11.9) 41 (3.2) 3.40 (1.88 to 6.16) <0.0001
Overcrowding§ 13 (4.2)  4 (0.3) 18.49 (3.62 to 94.48)  0.0005
Duvet tog:
 1-4  37 (11.9) 139 (10.7) 1.47 (0.90 to 2.39) 0.12
 5-8  59 (18.9) 91 (7.0) 3.97 (2.43 to 6.46) <0.0001
 ⩾9 26 (8.3) 32 (2.5) 3.26 (1.54 to 6.90) 0.002
*

Reference group for sleeping environment (first four variables) was infants who shared room, reference group for duvet thickness (last three variables) was infants who did not use duvet. 

Defined as longest period of infant sleep in previous 24 hours before last sleep: >4 v ⩽4 hours). 

>2 units of alcohol in 24 hours before last or reference sleep. 

§

Defined as >2 people per room (excluding kitchen not used for dining, toilet, bathroom, and hallways).