Table 3.

Accuracy of binary cutoffs by vertebra level and sex using the L3 classifier as reference. (L3 Low = the number of reference cases classified as “low”, e.g., L3 value below the L3 cutoff. Acc. = Overall accuracy. Sens. = sensitivity. Spec. = specificity).

	VB	Female					Male
		N	L3 Low	Acc.	Sens.	Spec.	N	L3 Low	Acc.	Sens.	Spec.
SMA	T10	156	2	98.7	50.0	99.4	122	0	100.0	NA	100.0
	T11	335	4	99.4	50.0	100.0	241	1	99.2	100.0	99.2
	T12	400	6	98.8	33.3	99.7	299	3	99.3	66.7	99.7
	L1	408	6	99.3	66.7	99.8	315	4	99.4	75.0	99.7
	L2	410	6	99.8	83.3	100.0	315	4	99.7	75.0	100.0
	L4	398	5	98.0	20.0	99.0	305	4	98.7	25.0	99.7
	L5	294	5	98.6	20.0	100.0	211	3	100.0	100.0	100.0
SMI	T10	156	2	99.4	100.0	99.4	122	0	100.0	NA	100.0
	T11	335	3	99.1	33.3	99.7	241	1	98.8	0.0	99.2
	T12	400	3	99.2	0.0	100.0	299	1	99.0	0.0	99.3
	L1	408	3	99.3	33.3	99.8	315	1	98.7	0.0	99.0
	L2	410	3	99.5	33.3	100.0	315	1	99.7	0.0	100.0
	L4	398	3	99.5	66.7	99.7	305	1	99.0	0.0	99.3
	L5	294	3	99.3	66.7	99.7	211	0	99.5	NA	99.5
SMRA	T10	156	9	95.5	33.3	99.3	122	6	97.5	66.7	99.1
	T11	335	12	98.5	75.0	99.4	241	8	95.0	37.5	97.0
	T12	400	12	98.5	83.3	99.0	299	8	98.7	75.0	99.3
	L1	408	12	99.0	75.0	99.7	315	8	97.8	62.5	98.7
	L2	410	12	99.0	75.0	99.7	315	8	99.4	87.5	99.7
	L4	398	12	98.2	75.0	99.0	305	9	98.0	55.6	99.3
	L5	294	9	98.0	66.7	98.9	211	6	98.6	66.7	99.5