Adjusted odds ratios† (ORs) and 95% confidence intervals (CIs) for gaseous pollutants‡ in relation to asthma hospitalisation in girls aged 6 to 12 years, Toronto
| Exposure averaging period | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 day | 2 days | 3 days | 4 days | 5 days | 6 days | 7 days | ||||||||
| Analysis | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI | OR | 95% CI |
| *p Value ≤0.05. †The odds ratios were calculated for an interquartile range increment of each gaseous pollutant, which was calculated based on daily levels. ‡CO=carbon monoxide; SO2=sulphur dioxide; NO2=nitrogen dioxide; O3=ozone. §A=odds ratios adjusted for daily weather conditions; B=odds ratios adjusted for particulate matter (PM10-2.5 and PM2.5) and daily weather conditions. | ||||||||||||||
| Daily average CO (0.5 ppm) | ||||||||||||||
| A§ | 1.00 | 0.93 to 1.06 | 1.01 | 0.94 to 1.10 | 1.00 | 0.91 to 1.09 | 0.98 | 0.89 to 1.09 | 1.01 | 0.91 to 1.13 | 1.03 | 0.92 to 1.16 | 1.04 | 0.93 to 1.17 |
| B§ | 1.00 | 0.93 to 1.07 | 1.01 | 0.92 to 1.10 | 0.99 | 0.90 to 1.09 | 0.97 | 0.87 to 1.08 | 0.99 | 0.89 to 1.11 | 1.02 | 0.90 to 1.15 | 1.05 | 0.93 to 1.20 |
| Daily average SO2 (7 ppb) | ||||||||||||||
| A | 1.04 | 0.97 to 1.11 | 1.04 | 0.95 to 1.13 | 1.05 | 0.95 to 1.16 | 1.09 | 0.98 to 1.22 | 1.13 | 1.00 to 1.28 | *1.17 | 1.02 to 1.34 | *1.20 | 1.04 to 1.39 |
| B | 1.06 | 0.98 to 1.14 | 1.03 | 0.93 to 1.14 | 1.04 | 0.92 to 1.17 | 1.08 | 0.95 to 1.23 | 1.12 | 0.97 to 1.29 | *1.18 | 1.00 to 1.38 | *1.28 | 1.08 to 1.51 |
| Daily average NO2 (11 ppb) | ||||||||||||||
| A | 0.99 | 0.92 to 1.06 | 1.03 | 0.94 to 1.12 | 1.07 | 0.96 to 1.18 | 1.09 | 0.97 to 1.21 | *1.14 | 1.02 to 1.28 | *1.16 | 1.02 to 1.31 | *1.16 | 1.02 to 1.32 |
| B | 0.99 | 0.92 to 1.08 | 1.02 | 0.92 to 1.12 | 1.05 | 0.93 to 1.18 | 1.07 | 0.93 to 1.22 | 1.12 | 0.98 to 1.29 | 1.16 | 1.00 to 1.35 | *1.21 | 1.03 to 1.42 |
| Daily maximum 1-hr O3 (20 ppb) | ||||||||||||||
| A | 0.86 | 0.78 to 1.04 | 0.90 | 0.78 to 1.02 | 0.92 | 0.79 to 1.07 | 0.95 | 0.80 to 1.13 | 1.02 | 0.84 to 1.23 | 1.00 | 0.82 to 1.23 | 0.93 | 0.75 to 1.16 |
| B | *0.86 | 0.78 to 0.96 | 0.88 | 0.77 to 1.01 | 0.89 | 0.76 to 1.04 | 0.92 | 0.77 to 1.10 | 0.97 | 0.80 to 1.18 | 0.95 | 0.78 to 1.17 | 0.89 | 0.72 to 1.12 |