Table 3

Risk of first-ever stroke associated with active smokers and ex-smokers, men and women aged 35–74 years

Smoking status		Reference group 1: non-smokers (exposed and not exposed to ETS)
		Patients with stroke (n = 521)				Community controls (n = 1851)		OR^3-150	95% CI
		n	(%)			n	(%)	OR^3-150	95% CI
Never smoked	162	31.1		901	48.7	1.00	Referent
Active smokers	164	31.5		255	13.8	4.14	3.04–5.63
⩾15 cigarettes/day	95	18.2		154	8.3	4.59	3.17–6.63
6–14 cigarettes/day	42	8.1		62	3.4	4.37	2.61–7.32
⩽5 cigarettes/day	27	5.2		39	2.1	2.56	1.35–4.88
Ex-smokers	174	33.4		671	36.2	1.00	0.75–1.32
<2 years	22	4.2		46	2.4	2.30	1.24–4.27
2–10 years	49	9.4		190	10.3	1.23	0.80–1.88
>10 years	103	19.8		435	23.5	0.79	0.57–2.51

↵3-150 Adjusted for age, sex, diabetes, hypertension, and history of heart disease in logistic regression analysis.
ETS = environmental tobacco smoke; OR = odds ratios; CI = confidence intervals.