Table 3.

The validity parameters of t-score measurements in FDEXA in the diagnosis of osteoporosis defined on histological basis

	Final diagnosis of osteoporosis based on histology
	Negative	Positive	Total
t-score in FDEXA indicative of osteoporosis (<–1)				Sensitivity	= 94.1
Negative	6	3	9	Specificity	= 25
Positive	18	48	66	PPV	= 72.7
Total	24	51	75	NPV	= 66.7
				False +ve	= 75
				False −ve	= 5.9
				Accuracy	= 72
t-score in FDEXA indicative of osteoporosis (<–2.5)				Sensitivity	= 88.2
Negative	15	6	21	Specificity	= 62.5
Positive	9	45	54	PPV	= 83.3
Total	24	51	75	NPV	= 71.4
				False +ve	= 37.5
				False −ve	= 11.8
				Accuracy	= 80