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Table 1 Descriptive statistics of daily count of hospital admissions for CVD, air pollutants, and weather conditions in Lanzhou, China, from Jan 1, 2014 to Dec 31, 2019

From: Acute effects of fine particulate matter (PM2.5) on hospital admissions for cardiovascular diseases in Lanzhou, China: a time-series study

 

\(\overline{X}\) ± S

Minimum

Percentile

Maximum

P25

P50

P75

CVD patients (I00–I99)

 Total

116 ± 111

1

39

84

150

676

 Male

69 ± 67

1

23

48

87

398

 Female

47 ± 45

1

17

34

62

304

 < 65

53 ± 50

1

17

35

65

332

 ≥ 65

63 ± 57

1

22

46

85

366

 IHD (I20–I25)

21 ± 19

1

7

14

28

126

 HRD (I47–I48)

16 ± 14

1

4

10

22

111

 HF (I50)

5 ± 4

1

2

3

7

27

 CD (I60–I69)

20 ± 14

1

10

18

26

100

Air pollutants

 PM2.5 (μg/m3)

48.92 ± 26.92

9.00

31.34

42.57

59.13

278.00

 PM10μg/m3)

114.84 ± 82.94

16.00

71.00

99.52

136.30

1484.54

 SO2 (μg/m3)

21.12 ± 13.83

3.54

10.35

17.00

28.23

81.87

 NO2 (μg/m3)

47.34 ± 17.28

7.80

36.08

45.91

54.61

146.60

 O38h (μg/m3)

88.24 ± 38.77

8.00

58.00

82.00

114.00

222.00

 CO (mg/m3)

1.24 ± 0.71

0.20

0.76

1.00

1.52

4.65

Meteorological factors

 Mean temperature (°C)

11.34 ± 9.83

− 12.30

2.40

12.70

19.90

30.40

 Relative humidity (%)

51.03 ± 15.08

11.71

39.50

51.17

62.00

96.09