Table 3.

The optimal cut-off point and its diagnostic performance for osteoporosis

	Cut-off point	95% CI
OP-femoral neck
Specificity	77.2	70.9–83.5
Sensitivity	75.0	46.2–91.7
NPV	97.8	93.4–99.5
PPV	18.8	10.0–32.2
OP-spinal
Specificity	75.2	67.8–81.3
Sensitivity	33.3	18.5–52.3
NPV	86.8	80.0–91.5
PPV	18.8	10.0–32.2

OP, osteoporotic; NPV, negative predictive value; PPV, positive predictive value; CI, confidence interval.