Table 1 Characteristics of samples included in this study

 Female

157 (61.6)

73 (60.8)

84 (62.2)

 ≥ 50 years old

180 (70.6)

78 (65)

102 (75.6)

 < 50 years old

75 (29.4)

42 (35)

33 (24.4)

Mean ages (SD)

57.01

56.31 (15.5)

58.28 (13.7)

 I

9 (3.5)

7 (5.8)

2 (1.5)

 II

136 (53.3)

66 (55)

70 (51.8)

 III

100 (39.2)

42 (35)

58 (43)

 IV

7 (2.7)

4 (3.3)

3 (2.2)

 V

3 (1.2)

1 (0.8)

2 (1.5)

 Blond

52 (20.4)

30 (25)

22 (16.3)

 Red

11 (4.3)

9 (7.5)

2 (1.5)

 Light Brown

82 (32.1)

39 (32.5)

43 (31.8)

 Dark Brown

89 (35)

32 (26.7)

57 (42.2)

 Black

21 (8.2)

10 (8.3)

11 (8.1)

 Blue

70 (28.1)

39 (33.3)

31 (23.5)

 Green

47 (18.9)

27 (23)

20 (15.1)

 Brown

131 (52.6)

51 (43.6)

80 (60.6)

 Black

1 (0.4)

0

1 (0.7)

 ≥ 50

41 (16.5)

33 (28.2)

8 (6.1)

 < 50

207 (83.5)

84 (71.8)

123 (93.9)

 ≥ 5

17 (6.8)

15 (12.8)

2 (1.5)

 < 4

231 (93.1)

102 (87.1)

129 (98.5)

 European

0.971

0.945

0.911

 African

0.010

0.022

0.039

 Native-American

0.013

0.032

0.048