Table 1 Age distribution of healthy subjects.

Age (years)	Men	Women	Total
20–29	77	56	133
30–39	30	15	45
40–49	20	11	31
50–59	43	37	80
60–69	43	30	73
70–79	24	19	43
80–89	12	5	17
Total	249	173	422