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Table 5 Associations between long-term exposure (2008–2012) to PM2.5 and NOX (per interquartile range) and respiratory symptoms among school children (7 to 13 years) in logistic regression analysis

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

  Wheezing OR (95% CI) Wheezing during exercise OR (95% CI) Asthma OR (95% CI) Dry cough OR (95% CI)
Model 1a (n = 594)   
PM2.5 (0.56 μg/m3) 1.33 (0.84–2.11) 1.29 (0.74–2.25) 0.97 (0.49–1.92) 1.29 (0.95–1.74)
NOX (7.43 μg/m3) 1.25 (0.64–2.46) 1.20 (0.53–2.74) 0.73 (0.28–1.95) 1.49 (0.97–2.28)
Model 2b (n = 506)   
PM2.5 (0.56 μg/m3) 1.58 (0.93–2.68) 1.43 (0.78–2.61) 1.05 (0.50–2.19) 1.40 (1.00–1.94)*
NOX (7.43 μg/m3) 1.35 (0.61–3.00) 1.25 (0.51–3.04) 0.76 (0.25–2.32) 1.50 (0.92–2.43)
  1. aAdjusted for gender and age
  2. bAdjusted for gender, age, education parents, molds, passive smoking, allergy, ventilation, fireplace, pets, family history for asthma predisposition, proportion time exposed in the five years and asthma predisposition (smaller study population due to non-responders of the questionnaire)
  3. *P < 0.05, ** p < 0.01, *** p < 0.001