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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Resuscitation. 2011 Jul 18;82(12):1501–1507. doi: 10.1016/j.resuscitation.2011.07.011

Table 2.

Predictors of Out-of-hospital Return of Spontaneous Circulation

Unadjusted OR
(95% CI)		 Adjusted OR
(95% CI)*
OR (95% CI) of ROSC per 10% linear
increase in CCF		 1.11 (1.05, 1.18) 1.05 (0.99, 1.12)
OR (95% CI) of ROSC by
chest compression category
  0–40% reference reference
  41–60% 1.12 (0.73, 1.71) 1.14 (0.72, 1.81)
  61–80% 1.53 (1.03,2.27) 1.42 (0.92,2.20)
  81–100% 1.83 (1.23,2.72) 1.48 (0.94,2.32)
OR (95% CI) of ROSC associated
with possible predictors
Age (per ten year increase) 1.04 (1.97, 1.10) 0.99 (0.93, 1.06)
Male 0.89 (0.73, 1.10) 0.81 (0.65, 1.00)
Public location 1.43 (1.06, 1.94) 1.26 (0.90, 1.75)
Bystander witnessed 2.55 (2.08, 3.13) 2.72 (2.18, 3.39)
Bystander CPR 1.16 (0.94, 1.42) 0.84 (0.67, 1.06)
Chest Compression rate
(per 10 compressions/minute increase)		 1.01 (0.96, 1.05) 1.02 (0.97, 1.07)
Time from 9-1-1 call to AED turned on (per 1 minute increase) 1.00 (1.00, 1.00) 1.00 (1.00, 1.00)

OR indicates odds ratio; CI, confidence interval; ROSC, return of spontaneous circulation; CCF, chest compression fraction; CPR, cardiopulmonary resuscitation; and AED, automatic external defibrillator.

*

Adjusted for age, sex, public location, bystander witnessed, bystander CPR, chest compression fraction, chest compression rate, time from 911 call to AED turned on, and ROC site.