Table 2:

Sensitivity, specificity, negative and positive predictive values of nasopharyngeal PCR compared to nasopharyngeal culture.

Organism	Na N=148	Prevalence % (95%CI)	TPb (n)	FP c (n)	TN d (n)	FN e (n)	Sensitivity % (95%CI)	Specificity % (95%CI)	Positive Predictive Value % (95%CI)	Negative Predictive Value % (95%CI)
H.influenzae	30	20.3 (14.3, 27.8)	28	20	98	2	93.3 (76.5, 98.8)	83.1 (74.8, 98.8)	58.3 (43.3, 72.1)	98.0 (92.3, 99.7)
S.pneumoniae	51	34.5 (27.0, 42.8)	48	39	58	3	94.2 (82.8, 98.5)	59.8 (49.3, 69.5)	55.1 (44.2, 65.7)	95.1 (85.4, 98.7)
M.catarrhalis	78	52.7 (44.3, 60.1)	72	32	38	6	92.3 (83.4, 96.8)	54.2 (42.0, 66.1)	69.2 (59.3, 77.7)	86.4 (72.0, 94.3)

^aChildren may have had more than one organism detected.

^bTrue positive

^cFalse positive

^dTrue negative

^eFalse negative