title: Predictive equations using regression analysis of pulmonary function for healthy children in Northeast China.
abstract: BACKGROUND
  There have been few published studies on spirometric reference values for healthy children in China. We hypothesize that there would have been changes in lung function that would not have been precisely predicted by the existing spirometric reference equations. The objective of the study was to develop more accurate predictive equations for spirometric reference values for children aged 9 to 15 years in Northeast China.
  
  
  RESULTS
  Spirometric measurements were obtained from 3,922 children, including 1,974 boys and 1,948 girls, who were randomly selected from five cities of Liaoning province, Northeast China, using the ATS (American Thoracic Society) and ERS (European Respiratory Society) standards. The data was then randomly split into a training subset containing 2078 cases and a validation subset containing 1844 cases. Predictive equations used multiple linear regression techniques with three predictor variables: height, age and weight. Model goodness of fit was examined using the coefficient of determination or the R(2) and adjusted R(2). The predicted values were compared with those obtained from the existing spirometric reference equations. The results showed the prediction equations using linear regression analysis performed well for most spirometric parameters. Paired t-tests were used to compare the predicted values obtained from the developed and existing spirometric reference equations based on the validation subset. The t-test for males was not statistically significant (p>0.01). The predictive accuracy of the developed equations was higher than the existing equations and the predictive ability of the model was also validated.
  
  
  CONCLUSIONS
  We developed prediction equations using linear regression analysis of spirometric parameters for children aged 9-15 years in Northeast China. These equations represent the first attempt at predicting lung function for Chinese children following the ATS/ERS Task Force 2005 guidelines on spirometry standardization.
authors.affiliation: Department of Biostatistics and Epidemiology, School of Public Health, China Medical University, Shenyang, Liaoning Province, PR China.
authors.forename: Ya-Nan
authors.initials: YN
authors.lastname: Ma
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Guang-Hui
authors.initials: GH
authors.lastname: Dong
authors.forename: Miao-Miao
authors.initials: MM
authors.lastname: Liu
authors.forename: Da
authors.initials: D
authors.lastname: Wang
authors.forename: Yu-Qin
authors.initials: YQ
authors.lastname: Liu
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Wan-Hui
authors.initials: WH
authors.lastname: Ren
authors.forename: Yungling Leo
authors.initials: YL
authors.lastname: Lee
authors.forename: Ya-Dong
authors.initials: YD
authors.lastname: Zhao
authors.forename: Qin-Cheng
authors.initials: QC
authors.lastname: He
mesh_terms: D000293:Adolescent; D002648:Child; D002681:China; D003710:Demography; D005260:Female; D006262:Health; D006801:Humans; D016014:Linear Models; D008168:Lung / Q000502:physiology*; D008297:Male; D015203:Reproducibility of Results; D012129:Respiratory Function Tests