Group (A) (n = 25)

Group (B) (n = 25)

Group (C) (n = 25)

Age (years)

Mean ± S.D.

53.9 ± 8.3

51.4 ± 8.1

52.5 ± 6.6

Sex

Male (n = 56)

23 (92%)

13 (52%)

20 (80%)

Female (n = 19)

2 (8%)

12 (48%)

5 (20%)