Table I.

Age distribution of subjects

Age group	Female (y) (mean ± SD)	Male (y) (mean ± SD)
20–29	25.0 ± 2.4 (n = 15)	24.3 ± 1.8 (n = 28)
30–39	32.9 ± 2.8 (n = 11)	34.0 ± 3.0 (n = 22)
40–49	46.0 ± 2.4 (n = 9)	45.8 ± 3.0 (n = 6)
50–59	55.9 ± 2.1 (n = 27)	56.0 ± 2.6 (n = 8)
60–69	64.8 ± 2.8 (n = 29)	64.8 ± 3.0 (n = 34)
70–79	73.6 ± 3.1 (n = 21)	72.0 ± 2.1 (n = 8)
>80	84.3 ± 2.7 (n = 4)	86.4 ± 6.2 (n = 5)
<50	32.9 ± 8.8 (n = 35)	30.4 ± 7.4 (n = 56)
>50	65.1 ± 8.5 (n = 81)	66.5 ± 8.3 (n = 55)
All	55.4 ± 17.1 (n = 116)	48.3 ± 20.0 (n = 111)