Table 3

 Mean odds ratios (per 10 μg/m3 increase in NO2) from single-pollutant model, all available studies

Studies, nOdds ratio (95% confidence interval)
“H” indicates heterogeneity between study-specific results (p<0.10).
Wheeze51.01 (0.93–1.10)H
Asthma51.02 (0.94–1.09)
Bronchitis40.99 (0.88–1.12)
Phlegm31.05 (0.95–1.17)
Nocturnal cough41.13 (0.94–1.35)H
Morning cough31.15 (1.01–1.30)
Sensitivity to inhaled allergens51.13 (1.01–1.26)H
Hay fever51.04 (0.98–1.11)
Itchy rash41.05 (0.98–1.12)
Woken by wheeze41.06 (0.89–1.26)H
Allergy to pets41.14 (0.99–1.31)