Table 1 Summary statistics of daily air pollutants, weather conditions, and children hospital outpatients caused by respiratory diseases (N = 551,678) in Shijiazhuang from 2013 to 2015
Min | P25 | P50 | P75 | Max | |
|---|---|---|---|---|---|
Air pollutant concentration (μg/m3)a | |||||
NO2 | 13 | 36.8 | 51.9 | 71.6 | 176.8 |
O3 | 3.3 | 34.1 | 69.0 | 115.8 | 262.4 |
PM10 | 22.3 | 146.6 | 226.7 | 334.5 | 842.1 |
PM2.5 | 9.8 | 65.2 | 109.6 | 166.6 | 771.3 |
SO2 | 5.3 | 31.5 | 56.7 | 118.3 | 319.3 |
Meteorological measures | |||||
Temperature (°C) | −7.7 | 5.0 | 16.0 | 24.2 | 34.7 |
Humidity (%) | 11.5 | 43.0 | 58.4 | 72.3 | 98.0 |
No. of daily respiratory outpatients (J00-J98)b | 243 | 389 | 442 | 527 | 915 |
Acute upper respiratory infections (J00-J06) | 67 | 159 | 183 | 206 | 294 |
Pneumonia (J18) | 7 | 33 | 45 | 71 | 180 |
Other acute lower respiratory infections (J20-J22) | 68 | 124 | 149 | 216 | 400 |
Other diseases of upper respiratory tract (J30-J39) | 6 | 35 | 47 | 59 | 150 |
Chronic lower respiratory diseases (J40-J47) | 1 | 10 | 14 | 18 | 47 |
Other respiratory diseases (J60-J99) | 0 | 2 | 3 | 5 | 13 |
Age (N) | |||||
0–3 | 201 | 281 | 315 | 377 | 703 |
4–6 | 14 | 66 | 86 | 109 | 194 |
7–14 | 13 | 33 | 42 | 55 | 107 |
Season (N) | |||||
hot (Jun to Aug) | 285 | 366 | 407 | 437 | 551 |
Transition (Apr, May, Sep and Oct) | 263 | 403 | 443 | 476 | 690 |
Cool (Nov to Mar) | 243 | 408 | 562 | 700 | 915 |