Models showing the effect of stepwise adjustment, incidences (95% CIs)/ΔSD of pollutant relative to incidence at mean pollutant concentration (for ozone lag=0 days; for all other pollutants lag=2 days)
| Pollutant | ΔSD | Total cases | Cases <2 y | Cases >2 y | Total controls |
| Ozone unadjusted | −1.5 | 1.64 (1.32 to 2.04) | 2.69 (2.09 to 3.47) | 1.14 (0.86 to 1.52) | 1.00 (0.94 to 1.06) |
| +Seas | −1.5 | 1.39 (1.18 to 1.64) | 2.01 (1.61 to 2.52) | 1.04 (0.82 to 1.31) | 1.04 (0.98 to 1.11) |
| +Seas+temp | −1.5 | 1.24 (1.01 to 1.53) | 1.85 (1.42 to 2.42) | 0.91 (0.68 to 1.21) | 1.06 (0.99 to 1.13) |
| +Seas+temp+ws | −1.5 | 1.26 (1.00 to 1.58) | 1.84 (1.37 to 2.48) | 0.93 (0.66 to 1.31) | 1.03 (0.97 to 1.10) |
| Seas+temp+ws+inf | −1.5 | 1.22 (0.96 to 1.55) | 1.65 (1.22 to 2.22) | 0.97 (0.69 to 1.36) | 1.04 (0.97 to 1.12) |
| Ozone unadjusted | +2.5 | 1.06 (0.81 to 1.30) | 1.19 (0.73 to 1.93) | 0.96 (1.37 to 0.83) | 1.10 (1.00 to 1.20) |
| +Seas | +2.5 | 1.26 (0.91 to 1.74) | 1.53 (0.89 to 2.62) | 1.11 (0.77 to 1.59) | 1.04 (0.95 to 1.14) |
| +Seas+temp | +2.5 | 1.45 (1.02 to 2.04) | 1.68 (0.97 to 2.92) | 1.31 (0.88 to 2.18) | 1.01 (0.92 to 1.12) |
| +Seas+temp+ws | +2.5 | 1.43 (1.00 to 2.04) | 1.69 (0.97 to 2.94) | 1.28 (0.86 to 1.91) | 1.03 (0.93 to 1.14) |
| +Seas+temp+ws+inf | +2.5 | 1.42 (0.99 to 2.03) | 1.63 (0.94 to 2.84) | 1.30 (0.87 to 1.94) | 1.03 (0.93 to 1.14) |
| SO2unadjusted | +1 | 1.11 (1.04 to 1.19) | 1.13 (1.04 to 1.24) | 1.10 (1.01 to 1.19) | 1.00 (0.98 to 1.02) |
| +Seas | +1 | 1.10 (1.02 to 1.18) | 1.09 (0.99 to 1.19) | 1.11 (1.01 to 1.21) | 1.01 (0.99 to 1.03) |
| +Seas+temp | +1 | 1.07 (1.00 to 1.14) | 1.05 (0.97 to 1.14) | 1.08 (0.99 to 1.18) | 1.02 (1.00 to 1.04) |
| +Seas+temp+ws | +1 | 1.07 (1.00 to 1.15) | 1.05 (0.97 to 1.13) | 1.09 (1.00 to 1.18) | 1.02 (1.00 to 1.03) |
| +Seas+temp+ws+inf | +1 | 1.07 (1.00 to 1.15) | 1.04 (0.97 to 1.12) | 1.09 (1.00 to 1.19) | 1.02 (1.00 to 1.03) |
| NO2unadjusted | +1 | 1.10 (1.03 to 1.18) | 1.17 (1.05 to 1.29) | 1.06 (0.99 to 1.13) | 1.01 (0.99 to 1.03) |
| +Seas | +1 | 1.07 (1.01 to 1.13) | 1.09 (0.99 to 1.20) | 1.05 (0.99 to 1.12) | 1.02 (1.00 to 1.03) |
| +Seas+temp | +1 | 1.05 (1.00 to 1.10) | 1.07 (0.98 to 1.17) | 1.04 (0.98 to 1.11) | 1.02 (1.00 to 1.03) |
| +Seas+temp+ws | +1 | 1.05 (1.00 to 1.10) | 1.06 (0.97 to 1.16) | 1.04 (0.98 to 1.11) | 1.02 (1.00 to 1.03) |
| +Seas+temp+ws+inf | +1 | 1.05 (1.00 tp 1.10) | 1.07 (0.98 to 1.17) | 1.04 (0.98 to 1.11) | 1.02 (1.00 to 1.03) |
| PM10 unadjusted | +1 | 1.07 (1.00 to 1.14) | 1.03 (0.96 to 1.11) | 1.09 (0.99 to 1.19) | 1.01 (0.99 to 1.03) |
| +Seas | +1 | 1.07 (0.99 to 1.15) | 1.01 (0.92 to 1.11) | 1.11 (1.00 to 1.22) | 1.01 (0.99 to 1.03) |
| +Seas+temp | +1 | 1.06 (0.98 to 1.13) | 1.00 (0.91 to 1.09) | 1.10 (1.00 to 1.21) | 1.01 (1.00 to 1.03) |
| +Seas+temp+ws | +1 | 1.06 (0.98 to 1.13) | 1.00 (0.92 to 1.08) | 1.10 (1.00 to 1.21) | 1.01 (1.00 to 1.03) |
| +Seas+temp+ws+inf | +1 | 1.06 (0.99 to 1.14) | 1.00 (0.92 to 1.09) | 1.10 (1.00 to 1.21) | 1.01 (1.00 to 1.03) |
| Average HC unadjusted | +1 | 1.14 (1.09 to 1.18) | 1.20 (1.13 to 1.28) | 1.09 (1.04 to 1.14) | 0.99 (0.97 to 1.01) |
| +Seas | +1 | 1.08 (1.04 to 1.12) | 1.10 (1.05 to 1.17) | 1.06 (1.00 to 1.12) | 1.00 (0.98 to 1.02) |
| +Seas+temp | +1 | 1.06 (1.03 to 1.10) | 1.09 (1.03 to 1.15) | 1.04 (0.99 to 1.10) | 1.00 (0.99 to 1.02) |
| +Seas+temp+ws | +1 | 1.06 (1.03 to 1.10) | 1.08 (1.02 to 1.14) | 1.05 (0.99 to 1.11) | 1.00 (0.98 to 1.02) |
| +Seas+temp+ws+inf | +1 | 1.06 (1.03 to 1.10) | 1.08 (1.02 to 1.14) | 1.05 (0.99 to 1.11) | 1.00 (0.98 to 1.02) |
Seas=season; temp=temperature; ws=wind speed; inf=infection.