Table 1.

Study population: distribution based on age and sex.

Age (Years)	Boys n (%)	Girls n (%)	Total
7	585 (49.45%)	598 (50.55%)	1183
8	886 (52.00%)	818 (48.00%)	1704
9	845 (47.47%)	935 (52.53%)	1780
10	1015 (49.32%)	1043 (50.68%)	2058
11	1141 (49.63%)	1158 (50.37%)	2299
12	999 (48.97%)	1041 (51.03%)	2040
13	982 (47.88%)	1069 (52.12%)	2051
14	989 (47.70%)	1084 (52.30%)	2073
15	1017 (45.93%)	1197 (54.07%)	2214
16	921 (47.82%)	1005 (52.18%)	1926
17	709 (45.10%)	863 (54.90%)	1572
18	332 (45.79%)	393 (54.21%)	725
Total	10,421 (48.19%)	11,204 (51.81%)	21,625