Table 4.

Sensitivity, specificity, PPV and NPV of each sample according to the type of infection (acute or chronic)

Type of infection	Sensitivity (%)	Specificity (%)	Positive predictive value (%)	Negative predictive value (%)	Accuracy
Acute
Synovial fluid	91.39	100	100	93.6	96.19
Periprosthetic tissue	78.94	80.95	78.95	80.95	80
Swab	80.65	99.3	98.68	88.68	91.91
Chronic
Synovial fluid	78.94	100	100	87.96	91.7
Periprosthetic tissue	56.98	80.95	67.12	73.38	71.23
Swab	39.53	99.29	97.14	73.06	76.75