Table 3.

Accuracy of microbiological tests for the diagnosis of pneumonia

	Comprehensive molecular testing	Viral PCR	Bacterial PCR	Routine methods
Sensitivity	61% (53–69)	35% (28–44)	39% (31–48)	14% (82–21)
Specificity	50% (39–61)	76% (65–85)	68% (57–78)	94% (86–98)
Positive predictive value	68% (62–74)	73% (62–81)	68% (59–76)	81% (61–93)
Negative predictive value	42% (35–50)	40% (36–45)	39% (34–44)	38% (36–41)
Positive likelihood ratio	1.23 (0.94–1.61)	1.50 (0.93–2.42)	1.23 (0.83–1.84)	2.55 (0.90–7.25)
Negative likelihood ratio	0.77 (0.56–1.06)	0.85 (0.70–1.01)	0.90 (0.72–1.10)	0.91 (0.83–0.99)
Diagnostic odds ratio	1.59 (0.89–2.85)	1.77 (0.92–3.41)	1.38 (0.75–2.55)	2.81 (0.91–8.65)