Table 1 Descriptive statistics of inpatients characteristics, air pollutants, and meteorological factors from 2017 to 2018
Variable | Total | Min | Mean | SD | Max | Percentile | ||
|---|---|---|---|---|---|---|---|---|
25th | 50th | 75th | ||||||
Atrial fibrillation | 5958.00 | 1.00 | 8.19 | 4.14 | 24.00 | 5.00 | 8.00 | 11.00 |
Age | Â | Â | Â | Â | Â | Â | Â | Â |
  < 65 years | 2061.00 | 1.00 | 3.00 | 2.05 | 12.00 | 1.00 | 3.00 | 4.00 |
  ≥ 65 years | 3897.00 | 1.00 | 5.43 | 2.80 | 16.00 | 3.00 | 5.00 | 7.00 |
Gender | Â | Â | Â | Â | Â | Â | Â | Â |
 Male | 2856.00 | 1.00 | 4.00 | 2.44 | 15.00 | 2.00 | 4.00 | 5.00 |
 Female | 3102.00 | 1.00 | 4.00 | 2.40 | 18.00 | 3.00 | 4.00 | 6.00 |
Season | Â | Â | Â | Â | Â | Â | Â | Â |
 Warm | 3089.00 | 1.00 | 8.42 | 4.22 | 23.00 | 5.00 | 8.00 | 11.00 |
 Cold | 2869.00 | 1.00 | 7.00 | 4.02 | 24.00 | 5.00 | 7.00 | 10.00 |
Medical expense | Â | Â | Â | Â | Â | Â | Â | Â |
 Total expense | 19,222.17 | 0.01 | 3.23 | 3.67 | 27.52 | 0.54 | 1.02 | 6.14 |
 Out-of-pocket health payment | 9353.13 | 0.00 | 1.57 | 2.38 | 19.25 | 0.17 | 0.41 | 2.23 |
Air pollutant | Â | Â | Â | Â | Â | Â | Â | Â |
 PM2.5 (μg/m3) | – | 3.03 | 42.80 | 32.32 | 264.62 | 20.50 | 33.50 | 54.22 |
 PM10 (μg/m3) | – | 4.13 | 66.57 | 43.54 | 441.48 | 35.53 | 55.05 | 85.89 |
 NO2 (μg/m3) | – | 2.03 | 29.80 | 15.47 | 127.10 | 18.40 | 26.40 | 38.00 |
 O3 (μg/m3) | – | 3.93 | 83.42 | 42.23 | 299.50 | 52.54 | 75.41 | 109.21 |
 CO (μg/m3) | – | 0.06 | 0.76 | 0.27 | 2.47 | 0.59 | 0.72 | 0.90 |
 SO2 (μg/m3) | – | 1.04 | 10.62 | 5.39 | 77.28 | 7.05 | 9.57 | 12.83 |
Meteorological | – |  |  |  |  |  |  |  |
 Temperature (℃) | – | − 9.51 | 17.63 | 7.38 | 34.39 | 10.76 | 17.98 | 23.90 |
 Humidity (%) | – | 15.31 | 77.46 | 11.89 | 99.98 | 70.15 | 78.77 | 86.45 |