Table 1 Descriptive statistics for the daily hospital admissions for total and cause-specific cardiovascular disease, air pollution concentrations, and weather conditions in Beijing, 2013–2017
| Â | Mean | SD | Minimum | P2 5 | Median | P7 5 | Maximum |
|---|---|---|---|---|---|---|---|
Annual-average daily hospital admission | |||||||
 Cardiovascular disease | 252 | 165 | 9 | 106 | 192 | 405 | 749 |
 Coronary heart disease | 207 | 142 | 2 | 77 | 159 | 340 | 632 |
 Atrial fibrillation | 13 | 11 | 0 | 4 | 10 | 22 | 53 |
 Heart failure | 32 | 16 | 0 | 20 | 29 | 43 | 90 |
Annual-average CO concentrations, mg/m3 | |||||||
| Â | 1.2 | 1.0 | 0.0 | 0.6 | 0.9 | 1.4 | 8.0 |
Annual-average pollution concentration (μg/m3) | |||||||
 PM2.5 | 76.9 | 66.4 | 0.0 | 30.0 | 59.0 | 102.0 | 477.0 |
 SO2 | 15.3 | 18.3 | 0.0 | 4.0 | 8.0 | 19.0 | 133.0 |
 NO2 | 49.7 | 23.3 | 0.0 | 34.0 | 44.0 | 61.0 | 155.0 |
 O3 | 95.7 | 63.0 | 0.0 | 49.0 | 80.8 | 136.0 | 366.7 |
Annual-average weather conditions | |||||||
 Mean temperature, °C | 13.9 | 10.9 | −14.1 | 3.1 | 15.3 | 23.9 | 32.6 |
 Relative humidity, % | 24.4 | 26.7 | 1.1 | 5.2 | 7.5 | 43.4 | 95.3 |
 Air pressure, hPa | 1016.7 | 10.3 | 994.1 | 1008.0 | 1016.5 | 1025.3 | 1044.4 |