Fig. 4From: Paraspinal muscle degeneration and lower bone mineral density as predictors of proximal junctional kyphosis in elderly patients with degenerative spinal diseases: a propensity score matched case–control analysisROC curve to find the optimum cut-off point of ES FI to predict postoperative PJK. AUC = 0.628 (95% CI, 0.542–0.713)Back to article page