Fig. 2

ROC curve, DCA, and nomograms. A Nomogram visualising the multivariable diagnostic model. To use the nomogram, find the position of each variable on the corresponding axis, draw a line to the points axis for the number of points, add the points from all variables, and draw a line from the total points axis to assess diagnostic probability of neurosyphilis at the lower line of the nomogram. B Calibration curves of the nomogram for the diagnostic probability of neurosyphilis in the training cohort (n = 148). C Validity of the performance of the nomogram in estimating the diagnostic probability of neurosyphilis in the validation cohort (n = 67). *AUC confidence interval and significance test adopt Bootstrap resampling 500 times