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Table 3 Rate ratios of ED visits occurring between December 21 and January 1

From: Assessing health impacts of the December 2013 Ice storm in Ontario, Canada

  Rate ratio 95 % CI
Model 1: Toronto in the storm year compared to Ottawa in the storm year
 Overall ED visits 1.08* 1.06-1.10
 Cardiac conditions 0.95 0.76-1.18
 Environmental causes 1.18 0.91-1.53
 Injuries 1.23* 1.17-1.29
Model 2: Toronto in the storm year compared to Toronto in the previous 5 years
 Overall ED visits 1.10* 1.09-1.11
 Cardiac conditions 0.75* 0.67-0.85
 Environmental causes 2.59* 2.23-3.01
 Injuries 1.26* 1.23-1.30
Model 3: Ottawa in the storm year compared to Ottawa in the previous 5 years
 Overall ED visits 1.11* 1.09-1.14
 Cardiac conditions 0.86 0.70-1.06
 Environmental causes 2.28* 1.73-3.00
 Injuries 1.03 0.97-1.08
Model 4: Storm year compare to the previous 5 years for both Toronto and Ottawa
 Overall ED visits 1.10* 1.09-1.11
 Cardiac conditions 0.78* 0.70-0.87
 Environmental causes 2.52* 2.21-2.87
 Injuries 1.23** 1.16-1.30
  1. *statistically significant difference
  2. **statistically significant interaction