CRP and atrial fibrillation: These assignments were: age (< 65 years = 0, over 65 years = 1); atrial fibrillation (absent = 0, present = 1); IDDM (absent = 0, present = 1); CRP (≤ 10 mg/L = 0, > 10 mg/L = 1); supplemental oxygen (0–4 LPM = 0, 4+ LPM or high flow O2 therapy = 1); pneumonia (absent = 0, present = 1); ischemia, reported on the clinical record or with an elevated troponin (> 0.4 ng/mL) (absent = 0, present = 1).