N | 117 | 117 | 104 |

True positives | 42 | 42 | 42 |

True negatives | 49 | 55 | 50 |

False positives | 26 | 20 | 12 |

False negatives | 0 | 0 | 0 |

Pretest probability (%) | 36 | 36 | 40 |

Sensitivity
(% (95% CI)) | 100 (92 to 100) | 100% (92 to 100) | 100 (92 to 100) |

Specificity
(% (95% CI)) | 65 (53 to 76) | 73% (62 to 83) | 81 (69 to 90) |

Positive likelihood ratio (95% CI) | 2.9 (2.1 to 3.9) | 3.8 (2.6 to 5.5) | 5.2 (3.1 to 8.6) |

Negative likelihood ratio (95% CI) | 0 | 0 | 0 |

Post-test probability given a positive test result (% (95% CI)) | 62 (49 to 73) | 68 (55 to 79) | 78 (64 to 88) |

Post-test probability given a negative test result (% (95% CI)) | 100 (93 to 100) | 100 (93 to 100) | 100 (93 to 100) |