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Receiver-operator characteristic (ROC) curves for the predictive validity of unadjusted CRP and oxLDL (per quartile increase) in lone AF patients. 1st, 2nd, 3rd, and 4th quartiles of biomarkers, respectively: CRP: <0.80 mg/L; 0.80 to <1.58 mg/L; 1.58 to <2.70 mg/L; ≥2.70 mg/L; oxLDL: <49.5 U/L; 49.5 to <61.5 U/L; 61.5 to <79.0 U/L; ≥79.0 U/L.
