Single pollutant models | Two pollutant models‡ | |||||
---|---|---|---|---|---|---|
Pollutant (μg/m3) | Cities (n) | Lag† | RR (95% CI) | Q (p value)§ | RR (95% CI) | Q (p value)§ |
*Random effects model, fixed effects model otherwise; †lag 01, average of pollutant concentrations of the concurrent day and the first lag; 0, pollutant concentrations of the concurrent day; ‡estimates of association for particulates were controlled for SO2-24h levels. Estimates of association for SO2 were controlled for black smoke concentrations if available, and TSP or PM10 otherwise; §p value for χ2 of heterogeneity. | ||||||
Black smoke | 7 | 01 | 1.011 (1.004 to 1.019) | 0.776 | 1.010 (1.001 to 1.019) | 0.733 |
24 h mean | ||||||
Total suspended particles | 5 | 01 | 1.013 (1.001 to 1.024) | 0.215 | 1.019* (0.997 to 1.041) | 0.074 |
24 h mean | 1.018 (1.004 to 1.033) | |||||
PM10 | 3 | 01 | 1.013 (1.001 to 1.026) | 0.476 | 1.003 (0.983 to 1.023) | 0.388 |
24 h mean | ||||||
SO2 | 13 | 01 | 1.012 (1.003 to 1.020) | 0.468 | 1.003 (0.992 to 1.015) | 0.318 |
24 h mean | ||||||
SO2 | 7 | 0 | 1.006 (1.003 to 1.008) | 0.414 | 1.005 (1.001 to 1.009) | 0.381 |
1 h maximum |