Table 1 Characteristic statistics of emergency department visits and emergency ambulance dispatches and meteorological variables in Pudong, Shanghai, during 2011-2013

Emergency department visits

4579

920

2578

3983

4472

5020

9862

Emergency ambulance dispatches

253

35

159

228

251

276

367

Mean temperature (°C)

17.2

9.4

−2.2

8.4

18.6

24.8

34.8

Maximal temperature (°C)

21.3

9.8

0.6

12.4

22.5

29.3

40.9

Minimal temperature (°C)

13.9

9.5

−5.0

5.4

14.8

22.4

29.3

Relative humidity (%)

71

12

31

63

73

80

97

Wind velocity (m/s)

1.7

0.7

0.1

1.2

1.6

2.1

6.1