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External validation of a Cox prognostic model: principles and methods

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Figure

Table 2 Multivariable prognostic model for the derivationdataset
Figure 1 Histogram of the PI in the derivation and validation datasets. The PI was centered on the mean in the derivation dataset
Table 3 Some methods for external validation and thelevel of information about the derivation study theyrequire
Table 4 Discrimination measures and hazard ratiosevaluated in the derivation and validation datasets
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