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Table 5 Average daily emergency department presentations and relative risks by illness characteristics, December to February 2000 to 2012

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

  Heatwave day ≥34°C Heatwave day ≥37°C
  Non-hot Single hot Heatwave RR* Non-hot Single hot Heatwave RR*
Acuity (triage)         
High (1 to 2) 0.04 0.16 0.63 4.69 0.04 0.50 3.80 81.72
  95% CI (0.03, 0.06) (−0.01, 0.33) (−0.23, 1.49) (2.30, 9.57) (0.03, 0.06) (−0.48, 1.48) (−0.73, 8.33) (21.54, 310.01)
Moderate (3) 0.28 0.89 1.83 4.89 0.31 1.50 5.20 17.21
  95% CI (0.24, 0.32) (0.26, 1.53) (0.9, 2.77) (3.47, 6.89) (0.27, 0.35) (−1.44, 4.44) (1.21, 9.19) (9.37, 31.62)
Low (4 to 5) 0.14 0.74 1.37 4.84 0.16 2.50 3.60 9.95
  95% CI (0.11, 0.16) (0.27, 1.21) (0.62, 2.12) (3.16, 7.42) (0.13, 0.19) (−0.44, 5.44) (0.01, 7.19) (5.19, 19.08)
Departure status        
Admitted 0.09 0.42 1.33 5.16 0.10 2.00 5.80 31.31
  95% CI (0.07, 0.11) (−0.01, 0.85) (−0.04, 2.71) (3.24, 8.21) (0.08, 0.12) (−1.92, 5.92) (−1.72, 13.32) (15.23, 64.37)
Discharged 0.34 1.26 2.03 4.87 0.38 2.50 4.80 14.69
  95% CI (0.3, 0.39) (0.5, 2.03) (0.82, 3.24) (3.51, 6.77) (0.33, 0.43) (−2.4, 7.4) (−1.09, 10.69) (8.22, 26.24)
Length of stay (hh:mm)    F -test ( P )     F -test ( P )
Mean 3:47 3:20 4:45 5.27 3:45 2:26 5:53 15.60
Minimum 0:08 0:44 0:21 (0.005) 0:08 0:44 1:18 (0.000)
Maximum 24:42 8:34 20:55   24:42 4:17 20:54  
SD 2:54 1:43 3:53   2:48 0:59 4:33  
  1. *Relative risk, heatwave days versus non-heatwave days (non-hot + single hot), controlled for relative humidity, particulate matter with <10 micrometers in aerodynamic diameter, ozone, nitrogen dioxide, day of week and long-term trends.