Radiographic indices for lumbar developmental spinal stenosis

Table 4 Cutoffs for lumbar developmental spinal stenosis

	Cutoff	Sensitivity	Specificity	Area under curve	p value	95% CI
SBW:PW
L1	2.0	0.76	0.50	0.67	0.18	0.53–0.81
L2	2.0	0.78	0.67	0.73	0.06	0.58–0.89
L3	2.2	0.90	0.83	0.92	0.001	0.83–1.00
L4	2.2	0.92	0.83	0.94	<0.001	0.88–1.00
L5	2.5	0.90	0.99	0.96	<0.001	0.91–1.00
S1	2.8	0.81	0.99	0.91	0.001	0.84–0.99
SBW:PPM
L1	1.2	0.64	0.50	0.57	0.56	0.42–0.73
L2	1.2	0.68	0.67	0.58	0.54	0.36–0.79
L3	1.2	0.76	0.67	0.66	0.20	0.45–0.87
L4	1.3	0.70	0.83	0.77	0.03	0.64–0.91
L5	1.4	0.71	0.83	0.81	0.01	0.68–0.94
S1	1.4	0.56	0.67	0.58	0.53	0.45–0.71
ABW:IPD
L1	1.6	0.81	0.50	0.70	0.11	0.49–0.90
L2	1.6	0.95	0.67	0.71	0.09	0.44–0.99
L3	1.6	0.90	0.67	0.77	0.03	0.60–0.95
L4	1.7	0.78	0.83	0.83	0.01	0.72–0.94
L5	1.7	0.61	0.83	0.72	0.09	0.58–0.85
S1	1.7	0.68	0.99	0.83	0.01	0.72–0.94

Abbreviations: SD standard deviation, SBW sagittal vertebral body width, PW pedicle width, PPM posterior pedicle margin, ABW axial vertebral body width, IPD interpedicular distance

ISSN: 2397-1789