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ROC curve analysis of testicular volume as a predictor of mTESE sperm retrieval outcomes in patients with iNOA. The diagonal area under the ROC curve (red line, line segment from 0 to 1) was 0.5. ROC: receiver operating characteristic; mTESE: microsurgical testicular sperm extraction; iNOA: idiopathic nonobstructive azoospermia.
