Table 2.

Descriptive data and t-tests of the mean BMI by age, type of school, and sex among primary school children aged in Dar es Salaam (N = 1781).

	n	Mean BMI	SD	p value
By age group
8–10	939	18.02	3.11	0.001
11–13	842	18.41	4.35
By type of school
Public	1103	17.94	4.57	0.021
Private	678	18.00	3.41
By sex
Female	1028	18.50	4.89	0.001
Male	753	17.61	2.84