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Prediction performance in C-index of different algorithms comparing (1) patients 65 years or younger versus older than 65 years, and (2) patients with ≤ 9 (median) versus > 9 comorbidities. Plot rows depict different subsets of patients, while plot columns show the C-index empirical distributions for the clinical versus clinical + imaging feature models (left) and the distribution of improvement in the C-index (right).
