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ROC curve analysis of the PQRST score to predict LVEF < 40%. The AUC was (A) 0.824 (95% CI 0.768–0.880) in the derivation cohort and (B) 0.899 (95% CI 0.833–0.966) in the validation cohort. ROC, receiver operating characteristic; AUC, area under the curve; CI, confidence interval; LVEF, left ventricular ejection fraction.
