Effect estimates# of the association between two pollutants, jointly in one model, and the health outcomes (odds ratios (OR) and 95% confidence intervals (CI) are given for an increase of one interquartile range (IQR) as specified in table 4)
| Prevalence of | Pollutant | MC0.01–2.5 | Pollutant | NC0.01–0.1 | ||||
| OR | CI | OR | CI | OR | CI | OR | CI | |
| Inhaled short-acting β2-agonist use¶ | ||||||||
| NC0.01–0.1 | 1.07 | 0.97–1.18 | 1.07 | 0.98–1.18 | ||||
| NO2 | 1.10 | 1.02–1.19 | 1.00 | 0.89–1.12 | 1.09 | 1.02–1.18 | 1.01 | 0.90–1.13 |
| CO | 1.00 | 0.91–1.11 | 1.10 | 0.98–1.22 | 1.01 | 0.91–1.11 | 1.10 | 0.98–1.25 |
| SO2 | 1.05 | 0.99–1.11 | 1.07 | 0.98–1.17 | 1.06 | 1.00–1.12 | 1.08 | 0.99–1.19 |
| Inhaled corticosteroid use+ | ||||||||
| NC0.01–0.1 | 1.01 | 0.87–1.18 | 1.53 | 1.39–1.69 | ||||
| NO2 | 1.02 | 0.95–1.10 | 1.51 | 1.35–1.68 | 1.19 | 1.07–1.32 | 1.06 | 0.85–1.32 |
| CO | 0.89 | 0.81–0.98 | 1.63 | 1.49–1.78 | 0.81 | 0.72–0.91 | 1.82 | 1.54–2.15 |
| SO2 | Correlation coefficient larger than 0.8 | 1.24 | 1.19–1.29 | 1.28 | 1.15–1.44 | |||
| Wheezing¶ | ||||||||
| NC0.01–0.1 | 1.12 | 1.01–1.24 | 1.02 | 0.92–1.12 | ||||
| NO2 | 1.05 | 0.97–1.14 | 1.01 | 0.89–1.15 | 1.01 | 0.94–1.09 | 1.12 | 0.99–1.26 |
| CO | 1.15 | 1.04–1.27 | 0.96 | 0.86–1.08 | 1.09 | 0.98–1.22 | 1.05 | 0.92–1.19 |
| SO2 | 0.97 | 0.91–1.04 | 1.09 | 0.99–1.20 | 0.97 | 0.92–1.03 | 1.14 | 1.04–1.26 |
NC: number concentration of particles (numbers represent diameter of particles in µm)
NO2: nitrogen dioxide
CO: carbon monoxide
SO2: sulphur dioxide
MC: mass concentration of particles (numbers represent diameter of particles in µm)
#: adjusted for cubic trend, temperature, weekend, Christmas holidays, first order autocorrelation
¶: air pollution exposures: 5-day means
+: air pollution exposures: 14-day means