Retrospective Analysis of Infection Factors in Secondary Internal Fixation after External Fixation for Open Fracture of a Long Bone: A Cohort of 117 Patients in a Two-Center Clinical Study

Table 3

Discriminatory strengths of the three inflammatory biomarkers.

Infection markers	AUC	95% CI	Optimal cutoff value	Sensitivity	Specificity
WBC (×10^9/L)	0.697	0.572-0.821	6.69	94.1%	38.7%
ESR (mm/1 h)	0.732	0.608-0.856	39.45	58.8%	85.8%
CRP (mg/L)	0.812	0.698-0.926	18.79	82.4%	79.6%

The optimal cutoff value was obtained by calculating the maximum Youden index ().