Table 1 Age and sex distributions of people invited to participate.

Age (years)	Men No (%)	Women No (%)
50–54	26 963 (30.6)	27 943 (29.4)
55–59	19 106 (21.7)	18 849 (19.9)
60–64	15 591 (17.7)	15 909 (16.8)
65–69	13 834 (15.7)	15 893 (16.7)
70–74	12 549 (14.3)	16 344 (17.2)
Total	88 043	94 938