Table 1.

Demographic features of subjects

Case			Smoking	Occupational history (hard metal exposure)	Exposure (year/months) start/duration	Biopsy year	Exposure at diagnosis
	Age	Sex	history
1	39	M	Non	Hard metal shaping/drilling	2000/12	2006	No
2	53	M	Ex	Hard metal shaping/drilling	2002/30	2002	No
3	21	M	Non	Metal grinding	2005/32	2008	Yes
4	42	M	Ex	Hard metal shaping/drilling	2005/36	2009	Yes
5	48	M	Non	Metal grinding	2000/48	2004	NA
6	45	M	Non	Hard metal shaping/drilling	1982/60	1987	Yes
7	32	F	Non	Metal grinding	1988/60	1993	Yes
8	32	F	Non	Metal grinding	1997/72	2003	No
9	44	F	Non	Hard metal shaping/drilling	1990/72	1996	Yes
10	62	M	Non	Metal grinding	1963/72	2003	No
11	40	F	Non	Hard metal shaping/drilling	1997/96	2005	NA
12	48	M	Non	Metal grinding	1981/120	1992	NA
13	49	F	Non	Hard metal shaping/drilling	1999/120	2009	Yes
14	65	F	Non	Metal grinding	1988/144	2000	No
15	50	F	Non	Desk worker in hard metal factory	1985/168	1996	Yes
16	53	M	Non	Quality control of hard metals	1974/264	2001	NA
17	60	M	Ex	Hard metal shaping/drilling	1972/276	1995	Yes
18	53	M	Non	Hard metal shaping/drilling	1971/372	2005	Yes
19	65	M	Non	Hard metal shaping/drilling	1963/444	2008	Yes

NA, not available.