Subject age ( years) N % female
18 - 23 2282 29
24 - 29 1563 26
30 - 35 449 20
36 - 40 247 17
41- 46 245 24
46 - 52 339 35
53 - 57 241 38
58- 63 194 42
63 - 69 393 40
69 - 75 275 35