Table 4.
Optimism calculated performance for the C statistic, c-slope, D statistic and R2 for the multivariable models
| Statistic | Apparent Performance | Optimism (100 bootstrap replications) | Optimism adjusted performance (apparent minus optimism) |
|---|---|---|---|
| Model for participants with positive and negative FOBT results | |||
| C statistic | 0.863 | 0.002 | 0.860 |
| c-slope | 1.000 | 0.003 | 0.997 |
| D statistic | 2.519 | 0.028 | 2.491 |
| R2 | 0.602 | 0.005 | 0.597 |
| Model for negative FOBT patients only | |||
| C statistic | 0.604 | 0.007 | 0.597 |
| c-slope | 1.000 | 0.060 | 0.940 |
| D statistic | 0.572 | 0.039 | 0.533 |
| R2 | 0.072 | 0.010 | 0.062 |