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.