Model | Specificity (%) | Sensitivity (%) | |||||

No BC taken or negative BC (n = 3855) | No BC taken (n = 3535) | Negative BC (n = 320) | All positiveBC (n = 99) | CoNS BC (n = 73) | Mixed BC* (n = 12) | Known pathogen BC† (n = 14) | |

⩾2 clinical signs | 82.9 | 85.3 | 56.3 | 69.7 | 67.1 | 66.7 | 85.7 |

⩾2 clinical signs plus CRP response | 95.4 | 96.2 | 85.9 | 35.4 | 34.3 | 25.0 | 50.0 |

⩾3 clinical signs | 91.8 | 93.2 | 76.6 | 54.6 | 48.0 | 58.3 | 85.7 |

⩾3 clinical signs plus CRP response | 97.2 | 98.3 | 93.4 | 27.3 | 13.7 | 33.3 | 35.7 |

*9 mixed coagulase-negative staphylococci (CoNS), 2 CoNS and Gram-negatives, 1

*Staphylococcus aureus*and Gram-negative.†6

*S aureus*, 8 Gram-negatives.