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Area under curve (AUC) for C3 and C3c in identifying periodontitis from periodontal health at baseline. Receiver operating curves (ROC) of salivary A = C3 and B = C3c levels discriminating between patients with periodontitis and periodontally healthy controls at baseline. (A) C3, AUC = 0.91, CI = [0.81;1.00], (P < .001), (B) C3c, AUC = 0.84, CI = [0.69;1.00], (P < .001)
