Table 4.

The lung cancer incidence of the different cohorts and the subcohorts of the asbestos mine workers and the screening cohorts, men and women

Cohort	Smoking category	O	SIR	95% CI
Asbestos mine workers∗	Nonsmokers	3	0.36	0.07–1.05
	Smokers	75	3.21	2.53–4.02
	All smoking categories	78	2.46	1.95–3.07
Moderate exposure	Nonsmokers	1	0.24	0.01–1.32
	Smokers	15	2.29	1.28–3.77
	All smoking categories	16	1.49	0.85–2.41
Heavy exposure	Nonsmokers	2	0.49	0.06–1.76
	Smokers	60	3.57	2.73–4.59
	All smoking categories	62	2.97	2.28–3.80
Asbestosis patients∗	Nonsmokers	1	0.97	0.02–5.38
	Smokers	40	10.97	7.20–13.71
	All smoking categories	41	8.19	5.88–11.1
Asbestos sprayers	Nonsmokers	2	10.4	1.26–37.7
	Smokers	10	10.3	4.93–18.9
	Unknown smoking habits	10	12.9	6.17–23.6
	All smoking categories	22	11.3	7.10–17.2
Screening cohort	Nonsmokers	18	0.09	0.06–0.14
	Smokers	699	1.61	1.49–1.72
	Unknown smoking habits	277	1.53	1.35–1.71
	All smoking categories	994	1.23	1.16–1.30
Construction	Nonsmokers	15	0.08	0.05–0.13
	Smokers	657	1.58	1.47–1.70
	Unknown smoking habits	0	0.00	0.00–18.5
	All smoking categories	672	1.13	1.05–1.21
Shipyard∗	Nonsmokers	0	0.00	0.00–1.89
	Smokers	8	2.19	0.95–4.32
	All smoking categories	8	1.43	0.62–2.81
Asbestos industry	Nonsmokers	2	0.49	0.06–1.76
	Smokers	16	2.18	1.25–3.54
	Unknown smoking habits	0	0.00	0.00–173
	All smoking categories	18	1.57	0.93–2.48
Spontaneous∗,†	Nonsmokers	1	0.20	0.01–1.10
	Smokers	18	1.91	1.13–3.02
	All smoking categories	19	1.31	0.79–2.05
Questionnaire‡	All with unknown smoking habits	277	1.53	1.35–1.71

95% CI, 95% confidence interval; NA, not applicable; O, observed number; SIR, standardized incidence ratio.

^∗No persons with unknown smoking status in the cohort.

^†Those who spontaneously contacted the researchers willing to participate.

^‡Those who only answered the preliminary questionnaire.