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Retrospective Cohort Study
Copyright: ©Author(s) 2026.
World J Gastroenterol. Oct 28, 2026; 32(40): 120447
Published online Oct 28, 2026. doi: 10.3748/wjg.120447
Figure 7
Figure 7 Calibration curves for the overall survival nomogram at 9-, 12-, and 18-month. Patients were stratified into quartiles according to nomogram-predicted survival probability. Points represent the mean predicted probability vs Kaplan-Meier-observed survival for each quartile; error bars indicate 95% confidence intervals. The dashed diagonal represents perfect calibration. Original concordance index (C-index) = 0.792; 1000-bootstrap optimism-corrected C-index = 0.779 (optimism = 0.026). K-M: Kaplan-Meier; C-index: Concordance index.


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