Table 1.

Main characteristics of young adolescents included in this study

Variable	n	%
Sex
Male	2,703	51.50
Female	2,546	48.50
Location
Rural	2,850	54.30
Urban	2,399	45.70
Education grade
7	806	15.36
8	1,221	23.26
9	1,443	27.49
10	1,010	19.24
11	361	6.88
12	408	7.77
Only-child
Yes	2,468	47.02
No	2,781	52.98
Family types
Parents	4,780	91.06
Mother only	148	2.82
Father only	85	1.62
Other	236	4.50