Right

Middle

Left

Male

Female

p

Male

Female

p

Female

Male

p

Vertical grooves

26.6

14.8

<0.001

16.1

7.9

<0.05

21.0

15.1

<0.001

Intermittent vertical grooves

0.7

5.5

2.8

3.4

2.8

4.8

Forked grooves

53.8

38.1

22.4

17.9

64.3

49.1

Intersecting grooves

9.1

25.8

4.2

10.3

9.1

21.6

Reticular grooves

9.8

8.9

50.3

57

2.8

6.5

Others

0.0

6.9

4.2

3.4

0.0

2.7