(a)
(b)
(c)
Figure 3: ROC curves of the LIPS, ANG-2, and LIPS + ANG-2 models for predicting ARDS in group A (solid line) and group B (dotted line). (a) AUC for the LIPS model in group A was smaller than that in group B (0.652 versus 0.788); (b) AUC for the ANG-2 model in group A was larger than that in group B (0.749 versus 0.720); (c) AUC for the LIPS + ANG-2 model in group A was smaller than that in Group B (0.772 versus 0.847).