Hounsfield units in assessing bone mineral density in ankylosing spondylitis patients with cervical fracture-dislocation

Figure 3 Receiver operation characteristic curve to diagnose osteopenia and osteoporosis. A: Hounsfield unit measurement had a sensitivity of 92.2% and specificity of 87.5% with an area under the curve (AUC) of 0.931 (P < 0.05) in diagnosing osteopenia; B: Hounsfield unit measurement had a sensitivity of 80.0% and specificity of 91.7% with an AUC of 0.919 (P < 0.05) in diagnosing osteoporosis.