Table 3.

The ability of QUS Z-score at different cut points to determine DXA determined low BMD

BQI Z-score cut points	Sensitivity	specificity	PPV	NPV
0.0	18.06	100	100	03.05
−0.1	18.95	84.38	64.29	41.22
−0.3	19.51	84.42	57.14	49.62
−0.73	29.73	86.07	39.29	80.15
−1.00	31.82	84.67	25.00	88.55
−1.30	44.44	84.00	14.29	96.18
−1.40	50	83.66	10.71	97.71
−1.46	50	83.23	7.14	98.47
−1.48	50	83.23	7.14	98.47
−1.50	50	83.23	7.14	98.47
−1.52	50	83.23	7.14	98.47
−1.54	33.33	82.69	3.57	98.47
−1.58	33.33	82.69	3.57	98.47
−1.70	33.30	82.69	3.57	98.47
−1.80	0.0	82.17	0.00	98.47

PPV Positive predictive value, NPV Negative predictive value, BQI Bone quality index