Table 6.

Association of two histologically defined categories of SIDS with covariates compared to healthy, age-matched Dutch controls (n = 2,841). P-values and odds ratios for the two largest SIDS categories defined by year of death. 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	95.0% C.I. for OR		Significance	Odds ratio	95.0% C.I. for OR
			Lower	Upper			Lower	Upper
SIDS 1996–2000 (n = 59)
Prone sleeping	<0.001	22.6	9.59	53.3	<0.001	115.6	46.5	287.3
Postnatal smoking	0.07	2.24	0.94	5.38	0.009	5.41	1.52	19.25
Premature birth	0.09	2.19	0.88	5.47
Gender	0.57	0.81	0.39	1.67
Education parents	0.34	0.65	0.27	1.57	0.19	0.52	0.19	1.40
Ethnical origin parents	0.70	0.81	0.27	2.43	0.29	0.28	0.03	2.98
Lack of breastfeeding	0.27	0.63	0.28	1.43
Maternal prenatal smoking	0.47	1.49	0.51	4.44
SIDS 2001–2005 (n = 37)
Prone sleeping	<0.001	21.8	7.41	64.2	<0.001	82.9	25.2	272.6
Postnatal smoking	0.051	2.87	0.99	8.29	0.01	6.62	1.58	27.8
Premature birth	0.01	3.26	1.27	8.39
Gender	0.34	1.57	0.65	3.79
Education parents	0.11	2.83	0.78	10.3	0.76	1.26	0.29	5.52
Ethnical origin parents	0.73	1.26	0.34	4.69	0.69	0.61	0.05	6.74
Lack of breastfeeding	0.22	0.56	0.22	1.43
Maternal prenatal smoking	0.97	0.98	0.29	3.29