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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.