Table 3.

Summary statistics of air pollutant exposure levels of COVID-19 patients admitted from January 17 to March 3, 2020 in Zhejiang province.

Pollutants	Total (N = 569)	Disease severity		P-value
		Mild (N = 521)	Severe (N = 48)
PM2.5, µg/m3	31.2 (24.3-39.4)	31.2 (24.1-39.4)	31.6 (26.4-37.5)	0.37
PM10, µg/m3	45.9 (32.5-54.1)	45.4 (32.2-53.9)	49.2 (36.9-56.6)	0.07
NO2, µg/m3	14.8 (9.3-23.8)	14.5 (9.1-23.5)	18.2 (12.3-33.2)	0.01
CO, mg/m3	0.75 (0.64-0.86)	0.75 (0.63-0.86)	0.76 (0.71-0.95)	0.09
SO2, µg/m3	5.7 (4.6-6.7)	5.7 (4.6-6.7)	5.7 (4.3-6.8)	0.67

Data expressed as median (IQR).