Table 3.
Sub-population analysis results of the threshold point, cut-off point with the maximum RR, and the maximum value of pooled heatwave-related mortality risk (RR) by age and mortality cause group in the total, urban, and rural areas.
| Total | Urban | Rural | ||
|---|---|---|---|---|
| (229 Districts) | (147 Districts) | (82 Districts) | ||
| Aged 65 y+ | Threshold point (% of temperature) | 91% | - 1 | 93% |
| Maximum heat-RR (95% CI) | 1.13 (1.05, 1.21) | 1.13 (1.08, 1.18) | 1.20 (1.02, 1.40) | |
| Cut-off point with the maximum RR (%) | 98% | 95% | 98% | |
| Aged 0–64 y | Threshold point (% of temperature) | - 1 | - 1 | 98% |
| Maximum heat-RR (95% CI) | 0.98 (0.93, 1.03) | 1.00 (0.96, 1.04) | 1.27 (0.72, 2.24) | |
| Cut-off point with the maximum RR (%) | 86% | 86% | 99% | |
| Cardiorespiratory | Threshold point (% of temperature) | - 1 | - 1 | 93% |
| Maximum heat-RR (95% CI) | 1.08 (0.96, 1.21) | 1.06 (1.00, 1.13) | 1.32 (1.02, 1.71) | |
| Cut-off point with the maximum RR (%) | 98% | 95% | 98% | |
| Non-cardiorespiratory | Threshold point (% of temperature) | 91% | 90% | 96% |
| Maximum heat-RR (95% CI) | 1.07 (1.01, 1.13) | 1.09 (1.04, 1.13) | 1.13 (0.86, 1.48) | |
| Cut-off point with the maximum RR (%) | 97% | 95% | 99% |
1 The threshold points were not estimated because the slope after the predicted threshold point using a piecewise regression (a V-shape regression) model was negative.