Variable

Level of significance (%)

Age

BV + ve

%

BV − ve

%

BV + ve

BV − ve

15 - 24

10

18.2

27

15.4

13.4 - 44.1

17.2 - 30.7

25 - 34

38

69.1

124

70.9

17.2 - 30.7

69.3 - 82.8

35 - 44

7

12.7

24

13.7

9.6 - 41.1

58.9 - 90.4

Total

55

175