Table 1 Demographics of the four study groups (N = 93).

Age years (SD)

50.92 (12.6)

46.09(11.8)

57.28 (9.0)

56.53 (4.3)

0.129^A-B, 0.045^A-C, 0.100^A-D, 0.001^B-C, 0.002^B-D, 0.765^C-D

Sex M:F

19:15

15:12

16:1

9:6

0.980^A-B, 0.006^A-C, 0.788^A-D, 0.006^B-C, 0.780^B-D, 0.020^C-D

Education years (SD)

14.37 (2.1)

12.14 (1.5)

15.06 (2.0)

13.07 (2.2)

 < 0.001^A-B, 0.258^A-C, 0.062^A-D, < 0.001^B-C, 0.159^B-D, 0.012^C-D

Handedness R:L:A

30:1:3

24:1:2

14:3:0

11:2:2

N.S

RAB (SD)

8.00 (4.7)

26.84 (13.7)

9.14 (3.1)

23.14 (11.7)

0.001^A-B, 0.951^A-C, < 0.001^A-D, < 0.001^B-C, 0.842^B-D, < 0.001^C-D

BIS-11 (SD)

61.00 (16.5)

89.64 (11.3)

66.47 (13.3)

80.60 (19.6)

0.002^A-B, 0.573^A-C, 0.002^A-D, 0.002^B-C, 0.837^B-D, 0.011^C-D