求翻译，看不懂

Calibration curves were plotted to assess the calibration of the nonadherence nomogram. A significant test statistic implies that the model does not calibrate perfectly. To quantify the discrimination performance of the nonadherence nomogram, Harrell’s C-index was measured. The nonadherence nomogram was subjected to bootstrapping validation (1,000 bootstrap resamples) to calculate a relatively corrected C-index. Decision curve analysis was conducted to determine the clinical usefulness of the nonadherence nomogram by quantifying the net benefits at different threshold probabilities in the IRD cohort. The net benefit was calculated by subtracting the proportion of all patients who are false positive from the proportion of the patients who are true positive and by weighing the relative harm of forgoing interventions compared with the negative consequences of an unnecessary intervention.