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

Prevalence of respiratory symptoms (n = 594)

 Wheezing (%)

7

 Wheezing during exercise (%)

5

 Asthma (%)

4

 Dry cough (%)

20

 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 FVC^b

0.173

 Z-score FEV1^b

−0.070

 Z-score MMEF^b

−0.404

 Z-score FEV1/FVC^b

−0.448