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Table 5 The positive and negative predictive value of the model scores and the concordance index

From: A family history of breast cancer will not predict female early onset breast cancer in a population-based setting

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%
  1. * Percentage of correctly classified cases.