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| NO2 | SO2 | O3 | |
|---|---|---|---|
| Number of estimates | 12 | 9 | 6 |
| Model | Random-effect | Random-effect | Random-effect |
| Heterogeneity I2 (%) | 66.9 | 74.2 | 61.5 |
| Summary ER (%) (95% CI) | 1.12 [0.76, 1.48] | 0.75 [0.42, 1.09] | 0.62 [0.33, 0.92] |
ER, Excess risk (ER) percentages and 95% confidence intervals for different causes of mortality. CI, confidence interval. PM, Particulate matter.
