Table. Demographic Characteristics of the Study Schools and Children.

Characteristic	Experimental group (n = 17 schools and 2648 children)	Control group (n = 15 schools and 1325 children)
Type of school, No. (%)
Urban area	4 (23.5)	3 (20.0)
Private	6 (35.3)	5 (33.3)
No. of children per school, median of the mean (IQR)	77 (46-249)	49 (28-101)
Age per school at baseline, median of the mean (IQR), y	8.2 (6.3-9.0)	7.5 (6.0-8.3)
Age per school at follow-up, median of the mean (IQR), y	12.1 (10.3-12.5)	10.6 (10.0-12.5)
Boys per school, No. (%) [IQR]	33 (48.9) [41.9-55.0]	23 (51.3) [42.6-56.0]

Abbreviation: IQR, interquartile range.