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Table 1 Spearman’s correlation between environmental variables, December to February 2000 to 2012

From: The impact of heatwaves on emergency department visits in Brisbane, Australia: a time series study

 

Tmax

Relative humidity

O3

PM10

Relative humidity

-0.35**

   

O 3

0.26**

-0.31**

  

PM 10

0.33**

-0.29**

0.36**

 

NO 2

-0.02

0.04

-0.03

0.13**

  1. **P <0.01 (two-tailed). Number of days: 1,083. Tmax, daily maximum temperature in centigrade; O3, ozone; PM10, particulate matter with <10 micrometers in aerodynamic diameter; NO2, nitrogen dioxide.