Figure 1. Receiver operating characteristic curve for predicting biochemical pregnancy from serum β-hCG concentration on day 5 after blastocyst transfer in frozenthawed cycles. The y-axis represents the sensitivity and the x-axis 1-especificity.
Figure 1. Receiver operating characteristic curve for predicting biochemical pregnancy from serum β-hCG concentration on day 5 after blastocyst transfer in frozenthawed cycles. The y-axis represents the sensitivity and the x-axis 1-especificity.