Fig. 2From: Attenuated serum vasoactive intestinal peptide concentrations are correlated with disease severity of non-traumatic osteonecrosis of femoral headA Comparison of serum VIP levels among different FICAT stages. B Correlation of serum VIP levels with FICAT grade. C ROC curve analysis of VIP levels with regard to FICAT 2 vs FICAT 3. D ROC curve analysis of VIP levels with regard to FICAT 2 vs FICATBack to article page