Table 1.

Characteristics of the children of the Schoolgruiten Project and the Pro Children Study at baseline

Characteristics		Schoolgruiten Project		Pro Children Study
		N	Mean (SD) or %	N	Mean (SD) or %
Age of the children, years		344	10.0 (0.6)	255	10.7 (0.5)
Gender	Boys	147	42.7	104	40.3
	Girls	197	57.3	154	59.7
Ethnicity	Native Dutch children	133	38.7	112	48.9
	Children of Western ethnicity	18	5.2	16	7.0
	Children of non-Western ethnicity	193	56.1	101	44.1
Educational level of the parents	Low	108	35.9	94	43.5
	Moderate	108	35.9	60	27.8
	High	85	28.2	62	28.7