Summary of the ROCs and calibrations of the total and 50% cutoff point subgroups of thyroid nodules.

AUC, area under the receiver operating characteristic curve; CI: coefficient interval; E: the difference between the predicted and calibrated probabilities; E max: maximal error; E aver: average error;$p-value of higher than 50%: p>0.05 indicated that there is no difference between the predicted and calibrated probabilities, and it’s well calibrated.