Probability for surgical treatment in patients with lumbar spinal stenosis according to the stenotic lesion severity: a 5–10-year follow-up study

Table 2 Percentage of surgical patients according to combination of grades of maximal central and foraminal stenoses

		Grade of maximal central stenosis				P value^a
		0	1	2	3	P value^a
Grade of maximal foraminal stenosis	0	7.5%	22.5%	30.6%	61.0%	< 0.001
	1	11.4%	28.3%	39.6%	59.1%	< 0.001
	2	44.3%	45.0%	22.2%	62.3%	0.084
	3	46.8%	33.3%	41.7%	57.9%	0.122
P value^a		< 0.001	0.110	0.395	0.738

ISSN: 1471-2474