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Figure 2 Covariate distribution by propensity score quintile. Patients in the lowest propensity score quintile (Q1) are more likely to be older (mean ages for Q1, Q3, and Q5 of 72, 68, and 64, respectively) and have chronic obstructive pulmonary disease (COPD), diabetes mellitus (DM), stroke, renal failure (Renal), morbid obesity, peripheral vascular disease (PVD), and an index arrhythmia of cardiac arrest (Arrest). CABG = coronary artery bypass grafting; HTN = hypertension; lipid = hyperlipidemia; MI = myocardial infarction; PTCA = percutaneous transluminal coronary angioplasty; V. Fib = ventricular fibrillation; V. Tach = ventricular tachycardia; Q1 = quintile 1; Q3 = quintile 3; and Q5 = quintile 5 for propensity scores.