Table 6

Maternal smoking in SIDS cases and controls with crude and adjusted odds ratios (OR) by country, in Scandinavia 1992 to 1995, the Nordic epidemiological SIDS study

Country		Cases				Controls				Crude				Adjusted for age				Adjusted for age, maternal age, and education
Country		n	%			n	%			OR	95% CI			p	OR			95% CI	p	OR	95% CI	p
Norway
In pregnancy	51	71.8		93	34.7		4.1	2.3 to 7.3	<0.001		4.5	2.3 to 8.6	<0.001		3.9	2.0 to 7.9	<0.001
After pregnancy	49	69.0		96	36.2		4.2	2.3 to 7.6	<0.001		4.6	2.3 to 9.2	<0.001		4.2	2.0 to 8.9	<0.001
Sweden
In pregnancy	66	56.4		101	23.5		4.4	2.8 to 7.0	<0.001		5.5	3.1 to 9.9	<0.001		4.5	2.5 to 8.1	<0.001
After pregnancy	63	53.8		108	25.4		3.8	2.4 to 6.1	<0.001		4.8	2.7 to 8.4	<0.001		4.0	2.3 to 7.2	<0.001
Denmark
In pregnancy	33	60.0		59	35.8		3.1	1.5 to 6.3	0.002		3.3	1.5 to 7.2	0.004		1.9	0.8 to 4.7	0.17
After pregnancy	34	61.8		59	35.1		3.4	1.7 to 6.8	0.001		4.0	1.7 to 9.2	0.001		2.7	1.1 to 7.0	0.034

CI = confidence interval.