Table 2 Summary statistics of daily meteorological and air pollution data between 1st March 2017 and 28th February 2019.

From: Associations of apparent temperature with acute cardiac events and subtypes of acute coronary syndromes in Beijing, China

Environmental variables

Mean ± SD

Percentiles

Min

P25

P50

P75

Max

AT

11.90 ± 14.38

−16.7

−1.9

12.5

25.1

38.01

Tmean

13.80 ± 11.69

−9.2

2.6

15.3

24.5

32.5

Precipitation

1.53 ± 7.42

0.0

0.0

0.0

0.0

86.2

BP

1013.18 ± 10.37

991.9

1004.0

1013.0

1021.0

1040.0

WS

2.03 ± 0.82

0.5

1.5

1.9

2.4

6.2

RH

48.51 ± 19.96

11.0

31.5

47

65

93.5

CO

0.81 ± 0.41

0.2

0.5

0.8

1.0

2.9

NO2

40.72 ± 18.02

6.7

27.3

37.4

51.3

104.4

SO2

6.10 ± 4.31

2.0

2.9

4.7

7.9

32.4

O3

60.99 ± 36.96

3.6

34.3

54.1

81.4

182.5

PM2.5

50.46 ± 41.50

3.9

21.4

39.9

67.0

343.0

PM10

82.99 ± 64.66

9.0

44.3

67.7

104.3

883.3

AQI

80.82 ± 49.60

13.9

46.5

68.2

102.4

425.1

  1. SD, standard deviation; AT, apparent temperature; Tmean, daily mean of ambient temperature; BP, barometric pressure; WS, wind speed; RH, relative humidity; CO, carbon monoxide; NO2, nitrogen dioxide; SO2, sulfur dioxide; O3, ozone; PM2.5, particulate matter with a diameter less than 2.5 µm; PM10, particulate matter with a diameter ≥ 10 µm; AQI, air quality index.
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