
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.