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Figure 2. Receiver-operating characteristic curves for calcaneal ultrasonography (left) and the Osteoporosis Self-Assessment Screening Tool (OST) (right) in identifying dual-energy x-ray absorptiometry (DXA)–determined osteoporosis.
The plotted curves were derived from abstracted data of included studies for calcaneal ultrasonography and OST against DXA as the reference standard. QUI = quantitative ultrasound index. *Threshold for positive test result: central DXA T-score = –1.5.  Threshold for positive test result: central DXA T-score = –2.0.  Threshold for positive test result: central DXA T-score = –2.5.  Threshold for positive test result: calcaneal ultrasonography T-score = –1.0. ||Threshold for positive test result: bone mineral density T-score = –2.0. ¶Threshold for positive test result: bone mineral density T-score = –2.5. **Threshold for positive test result: OST score = –1.0.
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