| Internal validation (n = 312) | Temporal validation (n = 941) | External validation (n = 997) | |||
---|---|---|---|---|---|---|
Model (# predictors) | Polytomous c-index (95% CI) | Difference with best model (95% CI) | Polytomous c-index (95% CI) | Difference with best model (95% CI) | Polytomous c-index (95% CI) | Difference with best model (95% CI) |
Group 1: logistic regression models | ||||||
   LR-PC (10) | .67 (.58-.75) | - | .60 (.56-.65) | - | .60 (.55-.65) | - |
   MLR (9) | .64 (.56-.73) | .025 (-.004; .053) | .58 (.54-.62) | .020 (.000; .040) | .58 (.53-.62) | .028 (.000; .058) |
Group 2: kernel-based and logistic regression models (based on R1U variable selection)* | ||||||
   LR-PC2 (11) | .69 (.60-.77) | - | .59 (.55-.64) | - | .64 (.59-.68) | - |
   KLR-PC (11) | .67 (.59-.75) | .016 (-.013; .051) | .58 (.54-.63) | .012 (-.006; .027) | .61 (.57-.66) | .026 (.004; .049) |
   LSSVM-PC (11) | .66 (.58-.75) | .025 (-.007; .060) | .58 (.54-.62) | .015 (-.005; .035) | .61 (.57-.65) | .028 (.005; .052) |
   MKLR (11) | .64 (.56-.73) | .046 (.003; .086) | .57 (.52-.62) | .027 (.000; .056) | .58 (.53-.62) | .060 (.033; .092) |