Fig. 1From: Effusion detected by ultrasonography and overweight may predict the risk of knee osteoarthritis in females with early knee osteoarthritis: a retrospective analysis of Iwaki cohort dataReceiver operating characteristic curves for the effusion area and early knee osteoarthritis diagnosis. a ROC curve for male participants and b ROC curve for female participants. ROC: receiver operating characteristic, TPF: true-positive fraction, FPF: false-positive fraction, AUC: area under the curveBack to article page