|Adjusted Odds Ratio (95% CI)†|
|Spontaneous gasping or breathing during CPR||3.94 (2.09–7.44)|
|Age, yrs||0.57 (0.43–0.76)|
|Pulmonary edema||3.41 (1.53–7.60)|
|Cardiac arrest witnessed||1.49 (0.76–2.92)|
|Bystander CPR provision||1.19 (0.68–2.08)|
|Initial recorded cardiac arrest rhythm, min|
|VF or pulseless VT||16.50 (7.40–36.81)|
|Pulseless electrical activity||1.22 (0.45–3.34)|
|Emergency call to first response time, min||0.75 (0.51–1.09)|
|Total CPR duration, min||0.31 (0.19–0.51)|
|Epinephrine dosage, mg||0.47 (0.25–0.87)|
Abbreviations as in Table 1.
↵∗ The analytical sample consisted of 1,827 patients with documented 1-yr survival and cerebral performance category score, after multiple imputation of missing values for 34 patients with a missing value for 1 or more covariates (age [n = 2], cardiac arrest surroundings [n = 6], bystander CPR [n = 2], initial recorded cardiac arrest rhythm [n = 21], emergency call to first response time [n = 1], spontaneous gasping or breathing at any time during CPR [n = 7], elevated level of conscience [n = 7], ROSC during prehospital CPR [n = 2], and duration of CPR [n = 1]). Fifty imputed datasets were created with a total run length of 50,000 iterations and imputations made every 1,000 iterations.
↵† Odds ratios were adjusted for study arm and site. Odds ratios were expressed for 1 SD increment in patient age, emergency call to first response time, total CPR duration, and epinephrine dosage.