Fig. 4

Calibration curve of the tuberculosis nomogram. A Calibration curve of the tuberculosis nomogram in the primary set. B Calibration curve of the tuberculosis nomogram in the validation set. The calibration curve represents the agreement between nomogram-predicted risk of confirmed TB and actual diagnosis outcome. The spike histogram at the top shows the distribution of predicted risks. The dash line in diagonal shows a perfectly-calibrated model. Red and black solid lines show the nomogram in-sample calibration outcome and the bias-corrected calibration by bootstrap resampling 1000 times respectively