Age (Years)

Tribal (n = 65)

Nontribal (n = 135)

%

≤20

21 - 25

26 - 30

31 - 35

>35

70.77 ± 2.38^a

21.54 ± 1.32^a

6.15 ± 1.19^a

0 ± 0.00^a

1.54 ± 0.11^a

64.44 ± 2.13^b

25.93 ± 1.29^b

8.15 ± 1.13^a

1.48 ± 0.89^b

0 ± 0.00^b