Table 2. Hazard ratios of traffic accident death according to participant smoking status.

		Rate of events (per 1,000 person-years)	Age-adjusted			Fully-adjusteda
			Hazard ratio	95% CI	P-value	Hazard ratio	95% CI	P-value
Men
Non-smokers		0.24	reference			reference
Ex-smokers		0.30	1.14	0.72, 1.79	0.58	1.13	0.72, 1.79	0.59
Current smokers	<20 cigarettes/day	0.36	1.32	0.80, 2.19	0.28	1.32	0.79, 2.20	0.28
	≥20 cigarettes/day	0.32	1.60	1.03, 2.47	0.04	1.54	0.99, 2.39	0.06
Women
Non-smokers		0.12	reference			reference
Ex-smokers		0.13	1.19	0.17, 8.53	0.86	1.21	0.17, 8.73	0.85
Current smokers	<20 cigarettes/day	0	—	—	—	—	—	—
	≥20 cigarettes/day	0	—	—	—	—	—	—

CI, confidence interval; —, no observation.

^aIn the fully-adjusted model, we adjusted for age and alcohol intake.