Incidence and Risk Factors for Surgical Site Infection after Femoral Neck Fracture Surgery: An Observational Cohort Study of 2218 Patients

Table 1

Optimum cut-off value of continuous variables detected by the ROC analysis.

Variables	Cut-off value	Area under the ROC curve (AUC)	value	95% CI
Time to surgery	5.5	0.65	0.02	0.527-0.771
Operative time	2.0	0.66	0.03	0.526-0.746

Abbreviations: CI: confidence interval; ROC: receiver operating characteristic.