Test Result | Disease Present | Disease Absent | Total |

Patients with 1% pretest probability of disease | |||

Positive | 95 | 990 | 1,085 |

Negative | 5 | 8,910 | 8,915 |

Total | 100 | 9,900 | 10,000 |

Predictive value | 8.8^{b} | 99.9^{c} | |

Patients with 10% pretest probability of disease | |||

Positive | 950 | 900 | 1,850 |

Negative | 50 | 8,100 | 8,150 |

Total | 1,000 | 9,000 | 10,000 |

Predictive value | 51.4^{b} | 99.4^{c} | |

Patients with 50% pretest probability of disease | |||

Positive | 4,750 | 500 | 5,250 |

Negative | 250 | 4,500 | 4,750 |

Total | 5,000 | 5,000 | 10,000 |

Predictive value | 90.5^{b} | 94.7^{c} |