Table 1 Description of scarlet fever incidence, air pollution and meteorological factors from 2014 to 2018 in Qingdao city
Variables | Period | Mean ± SD | Min | P25 | Median | P75 | Max |
|---|---|---|---|---|---|---|---|
Daily morbidity of scarlet fever(1 × 108) | No air pollution period | 3.7 ± 3.7 | 0 | 1.1 | 2.2 | 5.4 | 23.9 |
Air pollution period* | 4.3 ± 4.2 | 0 | 1.1 | 3.3 | 6.5 | 22.6 | |
PM2.5 (μg/m3) | No air pollution period | 32.6 ± 16.9 | 0 | 19.8 | 29.0 | 43.0 | 95.0 |
Air pollution period* | 89.0 ± 44.5 | 0 | 58.0 | 83.5 | 107.0 | 304.0 | |
PM10 (μg/m3) | No air pollution period | 70.0 ± 66.0 | 0 | 48.0 | 66.0 | 90.0 | 165.0 |
Air pollution period* | 156.0 ± 63.1 | 0 | 119.0 | 150.0 | 186.0 | 455.0 | |
SO2 (μg/m3) | No air pollution period | 17.9 ± 12.4 | 2.0 | 9.0 | 15.5 | 23.0 | 79.0 |
Air pollution period* | 33.8 ± 22.2 | 2.0 | 18.0 | 28.0 | 43.0 | 132.0 | |
CO (mg/m3) | No air pollution period | 0.7 ± 0.6 | 0.2 | 0.5 | 0.6 | 0.8 | 8.6 |
Air pollution period* | 1.3 ± 0.8 | 0.4 | 0.9 | 1.1 | 1.5 | 12.6 | |
NO2 (μg/m3) | No air pollution period | 31.9 ± 14.4 | 3.0 | 21.0 | 30.0 | 40.0 | 107.0 |
Air pollution period* | 48.7 ± 18.9 | 9.0 | 34.0 | 46.0 | 62.8 | 111.0 | |
O3 (μg/m3) | No air pollution period | 94.5 ± 32.2 | 0 | 68.0 | 95.0 | 119.0 | 161.0 |
Air pollution period* | 113.0 ± 60.7 | 0 | 58.3 | 99.0 | 168.8 | 254.0 | |
Cumulative precipitation (mm) | No air pollution period | 1.9 ± 7.7 | 0 | 0 | 0 | 0 | 121.4 |
Air pollution period* | 0.3 ± 2.6 | 0 | 0 | 0 | 0 | 39.2 | |
Average temperature (°C) | No air pollution period | 14.3 ± 9.6 | − 12.9 | 6.4 | 15.7 | 22.6 | 30.5 |
Air pollution period* | 11.9 ± 9.4 | − 4.4 | 3.7 | 9.9 | 20.1 | 30.6 | |
Average air pressure (KPa) | No air pollution period | 1000.8 ± 9.2 | 988.3 | 1000.4 | 1008.4 | 1015.8 | 1032.3 |
Air pollution period* | 1009.3 ± 8.7 | 987.8 | 1001.9 | 1010.4 | 1016.0 | 1027.6 |