Grade

Group A

Group B

Total

I

6 (20.7%)

9 (29%)

15 (25%)

II

15 (51.7%)

16 (51.6%)

31 (51%)

III

8 (27.6%)

6 (19.4%)

14 (24%)

Total

29 (48.3%)

31 (51.7%)

60 (100%)