Table 1.

Age and gender distributions of the study subjects

Age group (years)	Gender				Total	%
	Male		Female
	N	%	N	%
7	230	48.7	242	51.3	472	15.95
8	331	51.2	315	48.8	646	21.83
9	326	54.0	278	46.0	604	20.41
10	251	50.9	242	49.1	493	16.66
11	270	48.7	284	51.3	554	18.72
12	101	53.2	89	46.8	190	6.42
Total	1,509	51	1,450	49	2,959	100