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Table 1 Characteristics of school children and their environment (n = 594)

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

Characteristic (SD)

 

Gender (male %)

51

Age groups (%)

 7–8 years

28

 9–10 years

36

 11–13 years

36

Average height (cm)

141 (11)

Allergies (%)

8

Parental education (%)

 Primary school

0.2

 Lower general secondary education

18

 Higher general secondary education

49

 College, university

33

Passive smoking in house

11

Others members of the family has asthma

21

Indoor air pollution (%)

 Ventilation insufficient

67

 Wood burning stove

28

 Damp or mold

12

 Pets

58

Exposure to outdoor PM2.5 concentration (2008–2012)a (μg/m3)

 Median

0.37

 Interquartile range

0.56

 Minimum – Maximum

0.04–1.59

Exposure to outdoor NOX concentration (2008–2012)a (μg/m3)

 Median

2.50

 Interquartile range

7.43

 Minimum – Maximum

0.74–11.33

Time exposed to outdoor pollution (%)

 Five years or more

88

  1. aWithout background concentration