Figure 3
Distribution of bone density upon ICU admission. CT-based bone density was measured at the vertebral body of Th12. Cut-off values were based on previous findings by Pickhardt et al. 12 for distinguishing osteoporosis from non-osteoporosis. For vertebral level Th12, the study of Pickhardt et al. showed that a CT-attenuation threshold of 115 HU or less was 90% specific and 51% sensitive for osteoporosis. A threshold of 165 or less was 89% sensitive and 49% specific for osteoporosis. A threshold of 140 or less showed a balanced sensitivity and specificity of 75 and 74%, respectively. ICU intensive care unit
