Cost-effectiveness ratio (CER) by city in the nutrition & PA combined intervention group.

a For BMI, BAZ and overweight & obesity prevalence, the ‘effect’ means BMI, BAZ and overweight & obesity prevalence reduction (post intervention vs before intervention) in intervention group compared with that of in the control group, respectively. b ALL CER was presented in US dollars. c O & B means overweight & obesity. d Total’ means the average effect of four intervention centers (Jinan, Guangzhou, Harbin, Shanghai), Chongqing was excluded here because the intervention in this city was not effective (p>0.05).