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ROC analysis for clinical outcomes. (a) The ability of estradiol level on an hCG day to predict early abortion. The AUC was 0.663, and the optimal estradiol cut-off value was 1987.5 pg/mL. (b) The ability of estradiol level on an hCG day to predict early abortion. The AUC was 0.573, and the optimal estradiol cut-off value was 2020 pg/mL. ROC: receiver operating characteristic.
