Table 2 Descriptive statistics on daily outpatient visits in Lanzhou, China, during 2014–2016
Variables | Mean ± SD | Min | P25 | P50 | P75 | Max |
|---|---|---|---|---|---|---|
Outpatient visits (cases/per day) | ||||||
 Total | 303.23 ± 97.97 | 95.00 | 234.00 | 292.00 | 357.00 | 732.00 |
 Pneumonia | 21.48 ± 15.77 | 0.00 | 10.00 | 17.00 | 28.00 | 95.00 |
 Asthma | 8.49 ± 5.43 | 0.00 | 5.00 | 7.00 | 11.00 | 36.00 |
 Bronchitis and upper respiratory tract infection | 265.28 ± 83.04 | 85.00 | 209.00 | 260.00 | 312.00 | 668.00 |
 Other respiratory diseases | 7.98 ± 5.72 | 0.00 | 4.00 | 7.00 | 11.00 | 37.00 |
Sex | ||||||
 Boys | 174.43 ± 55.32 | 42.00 | 135.00 | 170.50 | 205.00 | 418.00 |
 Girls | 128.79 ± 44.38 | 42.00 | 97.00 | 124.00 | 154.00 | 314.00 |
Age (years) | ||||||
 0–3 | 28.45 ± 42.42 | 0.00 | 0.00 | 6.00 | 49.00 | 229.00 |
 4–6 | 136.33 ± 42.76 | 43.00 | 103.00 | 134.00 | 167.00 | 262.00 |
 7–13 | 138.45 ± 58.27 | 24.00 | 95.00 | 133.00 | 173.00 | 423.00 |
Season | ||||||
 Cold (Nov to Mar) | 351.60 ± 115.54 | 95.00 | 266.25 | 355.00 | 422.75 | 732.00 |
 Transition (Apr, May, Sep and Oct) | 285.93 ± 50.26 | 163.00 | 252.00 | 283.00 | 322.00 | 444.00 |
 Hot (Jun to Aug) | 246.60 ± 73.46 | 114.00 | 190.00 | 233.50 | 297.25 | 442.00 |