Table 1.

Demographics of the study population.

Characteristic	n	%
Age	13.39 ± 1.03	-
Gender
male	1494	50.5
female	1462	49.5
Only child
yes	1966	66.5
no	990	33.5
Residence
urban	1459	49.4
rural	1497	50.6
Grade
one	987	33.4
two	983	33.3
three	986	33.3
Residence in school
yes	421	14.2
no	2535	85.8