Table 4.
Association between exposure to air pollution and stroke mortality (per 10 μg/m3 increment)
| Air pollution | Mortality | Heterogeneity | ||
| NO. | OR (95% CI) | I2 (%) | P | |
| PM2.5 | 12 | 1.008 (1.005, 1.012) | 89.2 | 0.000 |
| PM10 | 10 | 1.006 (1.003, 1.010) | 83.3 | 0.000 |
| SO2 | 6 | 1.006 (1.005, 1.008) | 45.8 | 0.100 |
| NO2 | 10 | 1.009(1.003, 1.016) | 70.1 | 0.000 |
| CO | 5 | 1.045 (0.980, 1.115) | 50.6 | 0.091 |
| O3 | 6 | 1.005 (0.999, 1.010) | 84.8 | 0.000 |
OR odds ratios, NO. number, PM2.5 particulate matter with aerodynamic diameter less than 2.5 μm, PM10 particulate matter with aerodynamic diameter less than 10 μm, SO2 sulfur dioxide, NO2 nitrogen dioxide, CO carbon monoxide, O3 ozone