TABLE 1.

Sample characteristics of this study.

		n/Mean	%/SD
Gender	Boy	1,236	52.7
	Girl	1,108	47.3
Residence	Rural	266	11.3
	Suburban	514	21.9
	Urban	1,564	66.7
Siblings	Yes	1,155	49.3
	No	1,189	50.7
Live with parent	Yes	1,972	84.1
	No	372	15.9