Table 5.

Diagnostic value of different combinations of markers for chronic PJI diagnosis.

Combination	SF-IL4>1.7 pg/mL + CRP >18 mg/L	SF-IL4 >1.7 pg/mL + SF-PMN% >75%	CRP >18 mg/L + SF-IL4 >1.7 pg/mL+ SF-PMN% >75%
Sensitivity	0.88	0.91	0.53
Specificity	0.98	0.97	0.98
PPV	0.96	0.94	0.95
NPV	0.75	0.92	0.73
Accuracy	80.1%	96%	78.8%

PPV, positive predictive value; NPV, negative predictive value.