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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