No. of subjects

Sagittal Ra

Coronal Ra

Total Ra

Smooth group

24 (25.0%)

48.2 ± 22.4

52.1 ± 22.3

50.1 ± 21.3

Normal group

66 (68.8%)

52.9 ± 14.7

63.8 ± 15.9

58.3 ± 13.5

Rough group

6 (6.2%)

64.7 ± 17.6

76.6 ± 18.9

70.7 ± 16.4