Table 3.
HRs for 3-year average PM2.5 and mortality under different tertiles of NDVI
|
Tertile 1 (range −0·14 to 0·30) |
Tertile 2 (range 0·30 to 0·53) |
Tertile 3 (range 0·53 to 0·96) |
|||||
|---|---|---|---|---|---|---|---|
| HR (95% CI) | p value | HR (95% CI) | p value | HR (95% CI) | p value | ||
| Per 10 μg/m3 increase in 3-year average PM2·5 | 1·10 (1·06–1·14) | <0·0001 | 1·11 (1·07–1·16) | <0·0001 | 1·07 (1·02–1·11) | 0·0030 | |
| By residence | |||||||
| Urban area | 1·04 (0·98–1·11) | 0·20 | 1·12 (0·96–1·30) | 0·17 | 0·80 (0·61–1·06) | 0·12 | |
| Rural area | 1·12 (1·08–1·17) | <0·0001 | 1·12 (1·08–1·17) | <0·0001 | 1·07 (1·03–1·12) | 0·0014 | |
HR=hazard ratio. PM2·5=fine particulate matter. NDVI=normalised difference vegetation index.