Table 2.

Evaluation of the different diagnostic tools applied, n = 42.

Criteria	Joint aspirate culture	Tissue sample culture	Tissue sample PCR
P value	< 0.0001	< 0.0001	0.0035
Sensivity [95% CI]	0.67 [0.38, 0.88]	0.93 [0.68, 1.00]	0.3 [0.12, 0.62]
Specificity [95% CI]	0.96 [0.81, 0.99]	0.96 [0.81, 1.00]	1.0 [0.87, 1.0]
Positive predictive value [95% CI]	0.91 (0.59, 1.00]	0.93 [0.68, 1.00]	1.0 [0.48, 1.0]
Negative predictive value [95% CI]	0.83 [0.66, 0.95]	0.96 [0.81, 1.00]	0.73 [0.56, 0.86]
Likelihood ratio	18.0	25.20	–
Overall accuracy	0.86	0.95	0.76
Fleiss' kappa	0.53 (moderate)

Per patient, five to six tissue specimens were taken for culture, and one specimen was taken for tissue PCR.