Table 2.

Association of SIDS (n = 50) with covariates compared to healthy Dutch controls (n = 2,438); included were only cases and controls where it was reported that no maternal prenatal smoking is involved. P-values and odds ratios for the entire case group. P-values calculated with two-tailed Fishers’ exact test, OR and 95% CI for OR of the binary logistic regression of all covariates. Prone sleeping 1 is primary prone sleeping; prone sleeping 2 is secondary prone sleeping; supine sleeping is indicator. Postnatal smoking 1 is one parent smokes; postnatal smoking 2 is both parents smoke; no postnatal parental smoking is indicator. Education parents 1 is both low; education parents 2 is one low; both high educated is indicator. Ethnical origin parents 1 is one European Caucasian, one non-European Caucasian; ethnical origin parents 2 is both non-European Caucasian; both European Caucasian is indicator

Covariate	1				2
	Significance	Odds ratio	95% CI for OR		Significance	Odds ratio	95% CI for OR
			Lower	Upper			Lower	Upper
Prone sleeping	<0.001	19.3	7.73	48.1	<0.001	146.8	61.1	352.8
Postnatal smoking	0.018	2.50	1.17	5.34	0.041	4.54	1.06	19.4
Premature birth	0.11	2.06	0.86	4.95
Gender	0.62	1.20	0.59	2.44
Education parents	0.77	1.13	0.49	2.62	0.09	0.41	0.15	1.15
Ethnical origin parents	0.56	1.39	0.47	4.12	0.79	0.75	0.09	6.15
Lack of breastfeeding	0.27	0.63	0.27	1.44