Table 2 Summarized statistics for meteorology and air pollution in Qingdao, Shan Dong, 2014–2018
From: Ambient air pollutants and hospital visits for pneumonia: a case-crossover study in Qingdao, China
Variables | Mean | SD | Min | P25 | Median | P75 | Max | IQR |
|---|---|---|---|---|---|---|---|---|
Air pollutants | ||||||||
 PM2.5(μg/m3) | 44.817 | 33.955 | 4 | 22 | 35 | 57 | 304 | 35 |
 PM10(μg/m3) | 89.466 | 52.956 | 17 | 53 | 76 | 111 | 455 | 58 |
 SO2 (μg/m3) | 21.307 | 16.191 | 2 | 10 | 17 | 26 | 132 | 16 |
 NO2 (μg/m3) | 35.700 | 16.975 | 3 | 23 | 33 | 45 | 111 | 22 |
 CO (mg/m3) | 0.811 | 0.523 | 0.2 | 0.5 | 0.7 | 1 | 12.6 | 0.5 |
Meteorological factor | ||||||||
 Temperature (°C) | 13.857 | 9.246 | −11.5 | 5.6 | 14.6 | 22.1 | 30.6 | 16.5 |
 Pressure (hpa) | 10,081.610 | 89.996 | 9878 | 10,004 | 10,082 | 10,154 | 10,323 | 150 |
 Humidity (%) | 69.106 | 16.479 | 16 | 57 | 71 | 83 | 100 | 26 |