Table 1.

Distribution of the children by age, grade, and gender.

	n	Girls (%)	Boys (%)
Age
7	166	35.3	33.3
8	253	51.1	53.0
9	66	13.6	13.7
Total	485	100.0	100.0
Grade
I	224	48.4	44.3
II	261	51.6	55.7
Total	485	100.0	100.0