Percentile reference for vital capacity among children and adolescents in Shanghai

Objective To establish norm and curves for vital capacity among children and adolescents in Shanghai,and to provide basis for lung function surveillance.Methods Data were obtained from cross-sectional surveys among 15 421 school children form 6 districts in 2014,using LMS method to establish the percentile reference and curves.Results It showed an increasing trend with age,boys and girls lung capacity showed an upuard trend.Before 12 years old,the difference was not big,affer 12 years old,the difference increases gradually.with boys higher than girls(P<0.01).Average vital capacity among children in Shanghai was higher than national level(P<0.01).There is significant sex difference in vital capacity among children and adolescents in Shanghai.Conclusion Percentile curves established in this study provides an intuitive evaluation method for the functional measurement.