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Table 2 Summary statistics for air pollution levels and weather conditions in the 9 cities of Sichuan Province, 2017-2018

From: The short-term effects and burden of particle air pollution on hospitalization for coronary heart disease: a time-stratified case-crossover study in Sichuan, China

Pollutant

Mean ± SD

Min

Max

Percentiles

P25

P50

P75

Air pollution levels (μg/m3)

 PM10

71.7 ± 46.1

2.4

441.5

37.8

58.8

94.5

 PM2.5

46.0 ± 33.4

2.1

285.2

22.5

36.2

59.8

 NO2

30.0 ± 14.3

1.0

127.1

19.6

27.3

37.3

 O3

81.8 ± 41.6

1.7

310.1

51.1

74.3

107.5

 SO2

12.5 ± 6.8

1.0

149.6

8.2

11.0

15.0

Meteorological measures

 Temperature (°C)

17.4 ± 7.3

0.3

34.8

10.8

17.3

23.5

 Relative humidity (%)

77.2 ± 12.1

13.5

99.9

69.3

78.6

86.5

  1. aUnit: case-average expenses, thousand CNY