Age ranges (years)

Percentage (%)

Mean ± SD (years)

15 - 19

11

18 ± 1.4

20 - 24

19

23 ± 2.4

25 - 29

16

27 ± 2.7

30 - 34

14

33 ± 2.3

35 - 39

34

35 ± 3.1

40 - 45

6

43 ± 1.4

Total

100%

29.8 ± 2.2 years