Table 3.

Comparison of correct rate of children’s nutrition knowledge between the intervention group and control group (%).

	Baseline		First Year		Second Year		Change (Baseline-Second Year)
	Control	Intervention	Control	Intervention	Control	Intervention	Control	Intervention
Health is not only the absence of disease but also good psychological and social adaptability #,@,@@	30.8	45.0	58.3	67.1	73.2	84.8	42.4	39.8
The most abundant protein is meat, poultry, fish and eggs @,@@	26.8	30.5	42.3	47.7	62.2	63.6	35.4	33.1
The best source of calcium is milk @@,*	37.6	40.4	41.7	52.3	58.4	62.1	20.8	21.8
Iron deficiency anemia can be prevented by eating more lean meat and vegetables@,@@	48.7	49.3	62.8	63.1	70.0	75.5	21.3	26.2
A nutritious breakfast should include four types of food #,@@,**	6.0	10.0	6.8	14.6	10.3	25.7	4.3	15.7
China recommends that school-age children drink more than 300 g of milk and dairy products every day #,@,*,**	21.5	16.1	10.9	17.0	16.7	21.2	−4.8	5.1
Fresh vegetables and fruits cannot be substituted for each other @,@@,**	51.7	54.3	65.0	68.1	68.8	79.8	17.1	25.5
Coarse grains have more comprehensive nutritional characteristics than fine grains @,**	66.4	65.4	53.9	56.9	63.0	52.4	−3.4	−13.0
Obese children are more prone to hypertension, hyperlipidemia, and other diseases: yes @@,*,**	69.8	66.6	73.4	80.4	83.3	87.5	13.5	20.9
Food not less likely to deteriorate when put in the refrigerator #,@,@@	64.4	73.5	78.7	84.5	85.5	93.0	21.1	19.5

Note: A multilevel model was used to evaluate the effect of the intervention. Group effect: ^# p < 0.05; time effect: ^@ one year p < 0.05; ^@@ two years p < 0.05; time × group effects: * p < 0.05; ** two years p < 0.05.