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Table 2 Relative risk (95 % confidence interval) of extreme cold and hot temperatures on mortality, compared with city-specific optimum temperatures of the four cities*

From: The influence of temperature on mortality and its Lag effect: a study in four Chinese cities with different latitudes

Cities Extreme cold Extreme hot
Wuhan 4.78 (3.63,6.29) 1.35 (1.18,1.55)
Changsha 2.38 (1.35,4.19) 1.19 (0.96,1.48)
Guilin 2.62 (1.15,5.95) 1.22 (0.82,1.82)
Haikou 2.62 (1.44,4.79) 2.47 (1.61,3.78)
  1. *Extreme cold temperatures were set as the first percentile of daily mean temperature and lag period was set to 21 days. Extreme hot temperatures were set as 99th percentile of daily mean temperature and lag period was set to 3 days