Age (yr.)

Control group (%)

Case group (%)

Total

Up to 20

1(4%)

6(12%)

7

21 – 25

8(32%)

25(50%)

33

26-30

10(40%)

9(18%)

19

31-35

4(16%)

5(10%)

9

36 and above

2(8%)

5 (10%)

7

Total

25

50

75