Table 1 Summary statistics of outpatient visits, air pollutants and meteorological factors in Yichang, China
Variables | Number | Daily mean ± SD | Min | Median | Max |
|---|---|---|---|---|---|
Outpatient visits | |||||
 Total(ICD:A00-Z99) | 5,408,021 | 7418 ± 2376 | 889 | 7369 | 13,770 |
 Gender | |||||
  Male | 2,230,860 | 3060 ± 921 | 471 | 3037 | 5473 |
  Female | 3,177,161 | 4358 ± 1465 | 472 | 4328 | 8437 |
 Age (year) | |||||
  0~5 | 657,340 | 901 ± 285 | 116 | 871 | 1727 |
  6~64 | 3,808,042 | 5223 ± 1672 | 581 | 5167 | 9751 |
  65~ | 942,639 | 1293 ± 570 | 132 | 1323 | 2982 |
 Season | |||||
  warm | 2,676,916 | 7313 ± 2309 | 1404 | 7100 | 12,558 |
  cold | 2,731,105 | 7523 ± 2439 | 943 | 7504 | 13,770 |
 CVD(ICD:I00-I99) | 577,721 | 792 ± 337 | 47 | 811 | 1826 |
 RED(ICD:J00-J99) | 901,387 | 1236 ± 383 | 205 | 1225 | 2655 |
 NPD(ICD:F00-G99) | 248,344 | 340 ± 125 | 23 | 335 | 772 |
 GUD(ICD:N00-N99) | 567,368 | 778 ± 289 | 48 | 800 | 1752 |
 GID(ICD:K00-K93) | 432,391 | 593 ± 208 | 65 | 600 | 1142 |
Air pollutant (24-h Average) | |||||
 CO (mg/m3) |  | 1.07 ± 0.33 | 0.4 | 1.02 | 2.63 |
 PM2.5 (μg/m3) |  | 59.49 ± 42.32 | 4.5 | 48.17 | 263.12 |
 PM10 (μg/m3) |  | 95.26 ± 52.27 | 10.08 | 84.54 | 340.5 |
 NO2 (μg/m3) |  | 45.05 ± 21.21 | 13.21 | 33.33 | 81.21 |
 SO2 (μg/m3) |  | 12.27 ± 4.88 | 4.33 | 11.38 | 45.64 |
 O3 (μg/m3) |  | 45.05 ± 21.21 | 10.67 | 42.62 | 124.29 |
Meteorological factors(24-h Average) | |||||
 Temperature (°C) |  | 16.85 ± 8.19 | −1.1 | 17.15 | 32.6 |
 RH (%) |  | 76.82 ± 14.29 | 31 | 77.3 | 99 |