Table 1.
Statistical descriptions of cardiovascular admissions, atmospheric pollutants, and meteorological variables during the study period (2013–2017)
| Minimum | P25 | Median | Mean (SD) | P75 | Maximum | |
|---|---|---|---|---|---|---|
| Hospital admission | ||||||
| Cardiovascular disease | 9 | 106 | 192 | 252.4 (165.1) | 405 | 749 |
| Coronary heart disease | 2 | 77 | 159 | 207.1 (141.8) | 340 | 632 |
| Atrial fibrillation | 0 | 4 | 10 | 13.4 (10.5) | 22 | 53 |
| Heart failure | 0 | 20 | 29 | 32.0 (15.5) | 43 | 90 |
| Atmospheric pollutants | ||||||
| SO2 (μg/m3) | 0 | 4 | 8 | 15.31 (18.31) | 19 | 133 |
| NO2 (μg/m3) | 0 | 34 | 44. | 49.69 (23.34) | 61 | 155 |
| O3 (μg/m3) | 0 | 49 | 81 | 95.66 (63.039) | 136 | 367 |
| PM10 (μg/m3) | 0 | 50 | 86 | 102.30 (75.88) | 130 | 820 |
| PM2.5 (μg/m3) | 0 | 30 | 59 | 76.86 (66.38) | 102 | 477 |
| Meteorological factors | ||||||
| Average Temperature (°C) | −16.92 | 0.99 | 14.52 | 13.09 (12.34) | 24.09 | 38.51 |
| Maximum Temperature (°C) | −13.41 | 11.88 | 24.60 | 24.62 (15.80) | 35.83 | 59.89 |
| Minimum Temperature (°C) | −19.16 | −3.88 | 6.98 | 6.16 (12.08) | 17.06 | 30.94 |
| Humidity (%) | 1.121 | 5.24 | 7.47 | 24.38 (26.66) | 43.30 | 95.30 |
| Air pressure (hPa) | 970.5 | 985.50 | 993.0 | 993.90 (10.51) | 1001.5 | 1022.40 |
P25 = 25th percentile. P75 = 75th percentile. CO = carbon monoxide. PM2.5 = particulate matter with an aerodynamic diameter less than 2.5 μm. SO2 = sulfur dioxide. NO2 = nitrogen dioxide. O3 = ozone