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Table 2 Summary statistics for daily count of chronic obstructive pulmonary disease (COPD) hospital visits, daily fine particulate matter (PM2.5) concentrations and weather conditions between January 1, 2010, and June 30, 2012, in Beijing, China

From: Short-term effects of ambient fine particulate matter pollution on hospital visits for chronic obstructive pulmonary disease in Beijing, China

   

Percentile

  

Variable

Mean ± SD

Minimum

25th

50th

75th

Maximum

IQR

Outpatient visits

3854 ± 3199

15

1326

3427

5585

16,920

4259

Inpatient visits

44 ± 31

1

93

131

176

409

83

PM2.5 (μg/m3)

99.5 ± 75.3

7.2

42.5

82.8

133.3

492.8

90.8

Temperature(°C)

12.6 ± 11.6

−12.5

1.5

14.1

23.8

34.5

22.3

Relative humidity (%)

48.6 ± 20.3

9

30

48

66

92

36

  1. IQR Interquartile range, SD Standard deviation