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Construction of nomogram model. (A) Nomogram predicting 6MWD<350m for COPD patients; (B) Calibration curves for nomogram predicted 6MWD<350m for COPD patients; (C) ROC curve analysis show highest AUC value was seen for the nomogram model; (D) Decision curve analysis (DCA) shows the net benefit in 6MWD<350m predictions was the highest in nomogram model.
