Conditional logistic regression analysis of prehospital LR solution use and outcomes among propensity-matched patients with OHCA: 2005–2009 national data in Japan (n = 152,586).

aSignificant variables in Table 2 included cases by year, bystander eyewitness, emergency life-saving technician in ambulance, time from call to arrival at hospital, and epinephrine use.bSelected variables included age, sex, relationship of bystander to patient, bystander chest compression, bystander rescue breathing, use of public-access AED by bystander, first documented rhythm, origin of OHCA, and time from call to arrival at the scene. These variables have been shown to be factors in resuscitation outcome.cAll covariates included all variables except for endpoint variables in Table 2 and 46 dummy variables for the 47 prefectures in Japan.