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Table 2 Effects of type and origin by bystander CPR on survival of bystander-witnessed OHCAs having bystander CPR

From: CPR initiated after telephone-assisted instruction produces a better outcome of bystander-witnessed out-of-hospital cardiac arrests than no bystander CPR but is less effective than CPR on the bystander's own initiative

Factor Adjusted odds ratio 95% CI
Type of CPR   
   CC-only CPR 0.96 0.88 to 1.04
   Conventional CPR Reference  
Origin of CPR   
   Following telephone-CPR 0.73 0.67 to 0.80
   On bystander's own initiative Reference  
Aetiology   
   Presumed cardiac 2.27 2.05 to 2.51
   Noncardiac Reference  
Time intervals   
   Witness-call 0.99 0.98 to 0.99
   Witness-first CPR performed either by 0.98 0.97 to 0.99
   citizens or by EMTs   
   Call-arrival at patients 0.88 0.87 to 0.90
  1. Effects of type and origin by bystander CPR on 1-month survival with favourable neurological outcomes of bystander-witnessed OHCAs having bystander CPR (multiple logistic regression analysis).