Right

Middle

Left

Male

Female

p

Male

Female

p

Female

Male

p

Vertical grooves

14.0

13.1

<0.001

61.5

45.4

<0.05

5.6

7.9

0.710

Intermittent vertical grooves

6.3

2.1

8.4

6.5

3.5

3.1

Forked grooves

74.1

67.7

15.4

23.7

72.7

65.6

Intersecting grooves

4.9

12.7

1.4

4.1

14.7

17.9

Reticular grooves

0.7

2.4

11.2

17.9

2.1

3.4

Others

0.0

2.1

2.1

2.4

3.5

3.1