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Age. Standardised mortality ratio (SMR) as a function of age for the Simplified Acute Physiology Score (SAPS 3) model (left panel) and the artificial neural network (ANN) model (right panel) for the test set (n = 36,214). The ANN model was superior in correcting for age as a prognostic factor (the single most important prognostic factor) as compared to SAPS 3. SMR is shown with a 95% confidence interval
