Table 1.

The number of workers (N), followup period, and person years at followup, and percentages of men and current and ex-smokers in the different cohorts and subcohorts

Cohort	n	Follow up period	Person y by age		Men %	Smokers %∗
			< 60 y	≥ 60 y
Asbestos mine workers	734	1967–2012	11,049	8,333	80	67
Moderate exposure	257		4,316	3,199	76	55
Heavy exposure	477		6,733	5,134	82	74
Asbestosis patients	128	1978–2012	684	1,211	92	82
Asbestos sprayers	133	1967–2012	3,468	504	97	83
Screening cohort	24,214	1988–2012	187,024	254,849	96	69
Construction	17,236		130,343	187,724	97	70
Shipyard	117		283	1,658	91	67
Asbestos industry	496		4,120	4,619	80	61
Spontaneous†	672		7,965	5,085	94	68
Questionnaire‡	5,693		44,313	55,763	96	NA

NA, not applicable.

^∗Percentage out of persons with known smoking status.

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

^‡Those who only answered the preliminary questionnaire.