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Comparison of the optimal cutoff points of the four models on different subgroups of data sets. (A) Optimal decision values determined by the four models based on different stratified data validation sets. (B,C) Comparison of the six metrics (PPV, NPV, Accuracy, F1, Sensitivity and Specificity) corresponding to the optimal cut-off value taken by the four models on the unstratified data (B) and the 5-year age subgroup of the population (C.) test sets.
