Fig. 2

A ROC curves and cutoff values of the SIA corresponding to LS (a GLFS-25 score ≥ 16 points). The wider arrow and the larger font indicate the best cutoff value and corresponding sensitivity and specificity for each test group. B ROC curves and cutoff values of the SIA corresponding to LBP-related QOL (an ODI score ≥ 20%). The wider arrow and the larger font indicate the best cutoff value and corresponding sensitivity and specificity for each test group. Abbreviations: SIA, spinal inclination angle; LS, locomotive syndrome; GLFS-25, 25-question geriatric locomotive function scale; ROC, receiver-operating characteristic; LBP, Low back pain; QOL, quality of life; ODI, Oswestry Disability Index