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Table 1 Summary statistics of outpatient visits, air pollutants and meteorological factors in Yichang, China

From: Carbon monoxide and risk of outpatient visits due to cause-specific diseases: a time-series study 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
  1. Abbreviation: CVD cardiovascular diseases, RED respiratory diseases, NPD neuropsychiatric diseases, GUD genitourinary diseases, GID gastrointestinal diseases, RH relative humidity, SD standard deviation, min minimal, max maximal