Table 1.

Characteristics of the study cohort (N=2,488)

		N	%
Age at surveillance enrollment (years)	Mean (SD)	56.76 (11.99)	-
	0-54	970	38.99
	55-59	491	19.73
	60-64	430	17.28
	65-69	284	11.41
	70-74	170	6.83
	75-79	96	3.86
	80+	47	1.89
Exposure level	Low	477	19.17
	Medium	1691	67.97
	High	320	12.86
Years of exposure	Mean (SD)	18.28 (9.97)	-
	<10	481	19.33
	10-19	837	33.64
	20-29	796	31.99
	30+	374	15.03
Industry sector	Metalworking	294	11.89
	Shipbuilding	1,740	70.39
	Electric	96	3.88
	Insulation	89	3.60
	Other	253	10.23
Person-years of observation	before year 2000	4,588.56	17.37
	2000-2002	3,168.67	12.00
	2003-2005	5,650.95	21.39
	2006-2008	6,592.78	24.96
	2009-2011	6,414.82	24.28