Table 2

Characteristics of the final cohort

	N	%
Date of birth
<1900	781	11.1
1900–1909	933	13.2
1910–1919	1003	14.2
1920–1929	1177	16.7
1930–1939	1093	15.5
1940–1949	997	14.1
≥1950	1068	15.1
Date began employment
<1930	1170	16.6
1930–1939	544	7.7
1940–1949	1137	16.1
1950–1959	1350	19.1
1960–1969	1455	20.6
≥1970	1396	19.8
Vital status through 31 December 2004
Alive	3133	44.4
Deceased	3845	54.5
Unknown	74	1.0
Total	7052