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Table 1 Comparison of survival between OHCAs without bystander CPR and bystander CPR in bystander-witnessed OHCAs

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   
   No bystander CPR Reference  
   CC-only CPR following telephone-CPR 1.66 1.49 to 1.84
   Conventional CPR following telephone-CPR 1.67 1.48 to 1.89
   CC-only CPR on bystander's own initiative 2.22 1.99 to 2.49
   Conventional CPR on bystander's own initiative 2.36 2.10 to 2.66
Aetiology   
   Presumed cardiac 2.44 2.27 to 2.63
   Noncardiac Reference  
Time intervals   
   Witness-call 0.98 0.97 to 0.98
   Witness-first CPR performed either by 0.97 0.96 to 0.98
   citizens or by EMTs   
   Call-arrival at patients 0.93 0.92 to 0.94
  1. Comparisons of 1-month survival with favourable neurological outcomes between OHCAs without bystander CPR and with four types of bystander CPR in bystander-witnessed OHCAs (multiple logistic regression analysis).