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Table 2 Prevalence of respiratory symptoms in school children (7–13 years) and the lung function among these children

From: The effect of industry-related air pollution on lung function and respiratory symptoms in school children

Prevalence of respiratory symptoms (n = 594)  
 Wheezing (%) 7
 Wheezing during exercise (%) 5
 Asthma (%) 4
 Dry cough (%) 20
Average percent predicted spirometric lung function (n = 559)
 FVC (% predicted, SD) 101 (11)
 FEV1 (% predicted, SD) 101 (12)
 PEF (% predicted, SD) 101 (16)
 MMEF (% predicted, SD) 103 (25)
 FEV1/FVC (% predicted, SD) 100 (7)
 Low FVC (%)a 7
 Low FEV1 (%)a 9
 Low PEF (%)a 15
 Low MMEF (%)a 22
 Low FEV1/FVC (%)a 3
 Z-score FVCb 0.173
 Z-score FEV1b −0.070
 Z-score MMEFb −0.404
 Z-score FEV1/FVCb −0.448
  1. a< 85% predicted bGLI reference