Table 5 Performance and internal validation of all the multivariate cox proportional hazard models
MV model | c-index | 95% CI | Mean c-index from 1000 bootstraps | 95% CI based on 1000 bootstrap samples | Optimism | Optimism in % |
|---|---|---|---|---|---|---|
M1 | 0.7872 | 0.7648–0.8095 | 0.7891 | 0.7678–0.8111 | 0.0019 | 0.24% |
M2 | 0.7842 | 0.7617–0.8066 | 0.7878 | 0.7660–0.8103 | 0.0036 | 0.46% |
M3 | 0.7817 | 0.7591–0.8043 | 0.7840 | 0.7626–0.8066 | 0.0023 | 0.29% |
M4 | 0.7810 | 0.7588–0.8032 | 0.7841 | 0.7638–0.8056 | 0.0031 | 0.40% |
M5 | 0.7821 | 0.7598–0.8043 | 0.7839 | 0.7621–0.8072 | 0.0018 | 0.23% |
M6 | 0.7791 | 0.7564–0.8018 | 0.7715 | 0.7604–0.8034 | −0.0076 | −0.96% |