Table 1 Descriptive statistics for monthly scarlet fever cases and air pollution concentrations, and weather conditions in China, 2013–2018 (n = 2232).
From: Exposure to air pollution and scarlet fever resurgence in China: a six-year surveillance study
Variables | Mean | SD | Min. | P25 | P50 | P75 | Max. | §China guideline II |
|---|---|---|---|---|---|---|---|---|
No. of scarlet fever cases | 5123 | 2893 | 959 | 2704 | 4445 | 7262 | 12593 | / |
PM2.5 (μg/m3) | 51.28 | 29.09 | 8.00 | 31.00 | 44.00 | 64.00 | 225.00 | 35 |
PM10 (μg/m3) | 90.75 | 44.56 | 20.00 | 58.00 | 82.00 | 115.00 | 405.00 | 70 |
SO2 (μg/m3) | 24.35 | 22.00 | 2.00 | 12.00 | 17.00 | 28.25 | 228.00 | 60 |
NO2 (μg/m3) | 33.63 | 13.82 | 9.00 | 23.00 | 32.00 | 42.00 | 97.00 | 40 |
O3 (μg/m3) | 86.00 | 31.52 | 9.00 | 63.00 | 84.00 | 108.00 | 198.00 | 160 |
CO (mg/m3) | 1.08 | 0.47 | 0.30 | 0.80 | 1.00 | 1.20 | 4.90 | 4 |
Mean temperature (°C) | 13.54 | 10.78 | −22.68 | 6.49 | 14.91 | 22.21 | 32.00 | / |
Relative humidity (%) | 66.71 | 13.72 | 27.23 | 56.74 | 69.63 | 78.33 | 89.21 | / |
Air pressure (Pa) | 939.98 | 94.10 | 644.76 | 904.73 | 984.44 | 1001.48 | 1030.95 | / |
Precipitation (mm)a | 74.50 (74.53) | 72.66 (72.43) | 0.00 (0.00) | 14.22 (14.58) | 52.28 (52.42) | 118.12 (118.20) | 570.30 (570.30) | / |
Wind speed (m/s) | 2.17 | 0.50 | 1.07 | 1.80 | 2.12 | 2.49 | 4.30 | / |
Sunlight (h)a | 170.67 (170.50) | 59.24 (58.76) | 17.80 (17.80) | 129.59 (129.93) | 176.30 (175.45) | 214.21 (213.85) | 328.57 (328.57) | / |
