Table 1

Infant-parent bed-sharing and risk of SIDS

	Case		Control		Univariate		Multivariate
	n	%	n	%	OR	95% CI	OR	95% CI
Multivariate analysis adjusted for maternal age, education, smoking, drinking, and occurrence of urinary tract infection during pregnancy, social disadvantage, ⩾3 previous live births, z scores for weight by gestation, resuscitation required at birth, male sex, whether breastfeeding was initiated at birth, any history of illness during infant’s lifetime, baby prone to sweating, symptoms in 48 h prior to last/reference sleep, tog of clothing/bedding ⩾10, use of duvets, prone position, and absence of routine soother use during the last/reference sleep period. Odds ratios for all univariate analysis adjusted for infant age at death/interview.
“Other” refers to cases found: “between mother and other child” (n = 3), “at top of bed with older sibling, younger siblings at bottom” (n = 1), “baby down in middle/bottom of bed” (n = 2), “next to one sibling 13 years of age” (n = 1), or no information on location (n = 1).
*Odds ratio not available due to the lack of any control infants who co-slept on sofas/armchairs; †adjusted for maternal smoking and social deprivation.
Usual pattern
Not bed-sharing	188	71	780	94	Ref		Ref
Bed-sharing	75	29	47	6	5.09	1.86 to 13.92	5.20	1.86 to 14.50
Last sleep period
No sharing of sleep surface	121	47	728	88	Ref		Ref
Bed-sharing	128	49	101	12	5.30	2.29 to 12.24	3.53	1.40 to 8.93
Co-sleeping on sofas/armchairs	11	4	0	0	*	*	*	*

Next to one adult in bed	76	29	60	7	4.94	1.89 to 12.91	3.29	1.05 to 10.26
Between two adults in bed	44	17	39	5	5.20	1.20 to 22.55	4.68	1.09 to 19.99
Other	8	4	2	0.2	*	*	*	*

Bed-sharing (0–10 weeks)	71	28	16	2	8.07	2.24 to 29.03	8.02†	1.97 to 32.54
Bed-sharing (10–20 weeks)	39	15	36	4	16.38	2.95 to 90.69	6.63†	0.95 to 45.81
Bed-sharing (21–52 weeks)	15	6	36	4	2.11	0.40 to 11.11	1.63†	0.27 to 10.00
Bed-sharing (>52 weeks)	2	1	13	2	0.78	0.45 to 0.59	0.42†	0.01 to 14.17