Fig. 2

The decision tree for the validation cohort. The model performed well in predicting survival regardless of GERD (green) diagnosis [nodes 53&54 and 83&84] and poorly in predicting mortality regardless of GERD (red) diagnosis [nodes 91&92 and 77&78]. In one subgroup, our model performed well in predicting survival (green) [node 74] and poorly in predicting mortality (red) [node 73]. The bar chart in each node indicates the percentage of mortality. The predicted group is highlighted in yellow