Fig. 1From: Comparison between calcaneus quantitative ultrasound and the gold standard DXA in the ability to detect osteoporosis in chronic obstructive pulmonary disease patientsReceiver operating characteristics (ROC) curves for each QUS parameter (BUA, SOS, OSI, T-score) for detecting osteoporosis at a Femoral neck, b lumbar spine, and c Any site (defined as T-score ≤ −2.5 at either femoral neck or lumbar spine)Back to article page