Table 1

SIDS according to smoking habits during pregnancy and other lifestyle and sociodemographic factors

		Total no.	Number with SIDS	‰
Cigarettes/day	0	17536	8	0.46
	1–9	3249	5	1.54
	10+	4201	7	1.67
Parity	Primiparous	12750	10	0.78
	Multiparous	12236	10	0.82
Number of antenatal care visits	1–9	9336	8	0.86
	10+	13401	11	0.82
	Missing	2249	1	0.44
Sex of the child	Male	12834	10	0.78
	Female	12152	10	0.82
Maternal age (y)	15–24	4633	10	2.16
	25–50	20353	10	0.49
Marital status	Cohabiting	20176	14	0.69
	Single	916	2	2.18
	Missing	3894	4	1.03
Years of education	<10	7526	8	1.06
	10+	10502	5	0.48
	Missing	6958	7	1.01
Occupational status during pregnancy	Working	11961	10	0.84
	Unemployed	3853	2	0.52
	Student	1895	1	0.53
	Missing	7277	7	0.96
Caffeine intake during pregnancy (mg/day)	<400	12107	8	0.66
	400+	6407	6	0.94
	Missing	6472	6	0.93
Alcohol intake during pregnancy (drinks/week)	0	16539	15	0.91
	1–2	5581	2	0.36
	3+	2298	2	0.87
	Missing	568	1	1.76
Mother's height (cm)	<166	8447	6	0.71
	166–170	8149	5	0.61
	171+	7955	8	1.01
	Missing	435	1	2.30
Mother's prepregnancy weight (kg)	<50	1153	2	1.73
	50–59	9443	8	0.85
	60–69	9104	6	0.66
	70+	4792	3	0.63
	Missing	494	1	2.02