ABSTRACT
Objective To fit children and adolescents' normal values and curves of BMI with coefficient of skewness-median-coefficient of variation (LMS) method, so as to provide a reference for the monitoring of obesity in children and adolescents. Methods 15259 children and adolescents aged 7 to 18 years old were selected in Shanghai, and the height and weight of the subjects were measured . The LMS Chartmaker software was used to fit the percentile curves of BMI of boys and girls with age. With P3, P5, P10, P15, P25, P50, P75, P85, P90, P95, P97 as the reference curve. Results The percentile of students showed an increasing trend with the age increases, and the boys are higher than girls. The P50 of all age groups of boys and girls in Shanghai was higher than that of the national level. The P85 and P95 of BMI were basically equal to the national level in the early stage, and was higher than the national level in the later period. The curve of boys has entered the peak of BMI growth since 9 years old, after 12 years old, the growth rate is slow, the curve is still rising at 18 years old. The curve of girls has entered the peak since 10 years old, after 14 years old, the growth rate is slow, after 16 years old, the curve tends to be stable. Conclusion The BMI percentile curve constructed by LMS method can correctly reflect the growing development of children and adolescents, and the BMI of children and adolescents in Shanghai is higher than the national level.