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The positive and negative predictive value of the model scores and the concordance index
| Model score |
Positive predictive value |
Negative predictive value |
Concordance index* |
| Outcome: Woman with breast cancer under age 70 | |||
| 1 | 8.1% | 93.9% | 77.4% |
| ≥ 2 | 12.8% | 93.9% | 89.4% |
| Outcome: Woman with breast cancer under age 50 | |||
| 1 | 4.4% | 96.5% | 78.8% |
| ≥ 2 | 11.0% | 96.8% | 92.0% |
| Outcome: Woman with breast cancer under age 30 | |||
| 1 | 0.5% | 99.8% | 80.7% |
| ≥ 2 | 0.9% | 99.8% | 94.4% |
* Percentage of correctly classified cases.
