Apparent Performance of the Tophi Formation Risk Nomogram
The calibration curve of the nomogram that predicts the risks of tophi
formation amongst gout patients was demonstrated as having good
agreement with the cohort (Figure 3 ). The C-index was 0.854
(95% CI: 0.772–0.936) for the cohort, and was confirmed to be 0.810
when tested in a bootstrap validation with 1,000 hypothetical datasets.
This suggested the model’s good discrimination and prediction
capability.