Model | Specificity (%) | Sensitivity (%) | |||
No BC taken or negative BC | All positive BC | CoNS positive BC | Mixed growth positive BC | Recognised pathogen positive BC | |
⩾3 clinical signs, all babies | 76.2 (265/348) | 61.5 (131/213) | 46.9 (52/111) | 75.0 (18/24) | 78.2 (61/78) |
⩾3 clinical signs, babies ⩽31 weeks’ gestational age | 69.0 (109/158) | 72.2 (109/151) | 57.9 (44/76) | 88.2 (15/17) | 86.2 (50/58) |
⩾3 clinical signs plus CRP response, all babies | 84.8 (295/348) | 47.9 (102/213) | 28.8 (32/111) | 62.5 (15/24) | 70.5 (55/78) |
⩾3 clinical signs plus CRP response, babies ⩽31 weeks’ gestational age | 79.1 (125/158) | 57.0 (86/151) | 38.2 (29/76) | 70.6 (12/17) | 77.6 (45/58) |