Prediction of community acquired pneumonia with a bacterial pathogen detected | ||||
---|---|---|---|---|
Patients with a lower respiratory tract infection | Patients with radiological pneumonia | |||
All variables | RR ≥ 32/min and PCT ≥ 2.9 | RR ≥ 32/min and PCT ≥ 0.25 µg/l | RR ≥ 32/min and PCT ≥ 0.25 µg/l | |
Sensitivity | 88% | 88% | 94% | 94% |
Specificity | 87% | 88% | 82% | 87% |
Negative likelihood ratio | 0.1 | 0.1 | 0.1 | 0.1 |
Positive likelihood ratio | 6.8 | 7.5 | 5.1 | 7.1 |
Negative predictive value | 98% | 87% | 99% | 93% |
Positive predictive value | 56% | 89% | 48% | 89% |