Fig. 3

Receiver operating characteristic curve analysis of STD-RFthick and STD-RFcsa for the prediction of poor exercise tolerance (6MWD < 350 m) in the development set (A) and the validation set (B)
Receiver operating characteristic curve analysis of STD-RFthick and STD-RFcsa for the prediction of poor exercise tolerance (6MWD < 350 m) in the development set (A) and the validation set (B)