Journal of Orthopaedic Surgery and Research

Table 4 The ability of QUS T-score at the different cutoff to predict DXA-determined osteoporosis

From: Comparison between calcaneus quantitative ultrasound and the gold standard DXA in the ability to detect osteoporosis in chronic obstructive pulmonary disease patients

Site	QUS T-score*	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
Any site	−2.50	10.42	94.73	83.33	29.50
	−1.25	70.83	73.68	87.18	50.00
	−0.80	83.33	47.37	80.00	52.94
	−0.09	91.66	31.57	77.19	60.00
Femoral neck	−2.50	11.62	95.83	83.33	37.70
	−1.25	72.09	66.67	79.49	57.14
	−0.80	83.72	41.67	72.00	58.82
	−0.09	93.02	29.17	70.18	70.00
Lumbar spine	−2.50	14.70	96.97	83.33	52.46
	−1.25	85.29	69.70	74.36	82.14
	−0.88	91.18	45.45	63.27	83.33
	−0.09	97.06	27.27	57.89	90.00

PPV positive predictive value, NPV negative predictive value
^*The threshold value of QUS T-score below this point, osteoporosis is diagnosed by calcaneus QUS

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ISSN: 1749-799X

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