Magnetic resonance imaging findings of redundant nerve roots of the cauda equina

Table 3 Association of localization level of redundant nerve roots with relative length of redundant nerve roots and cross-sectional area

	Localization level of redundant nerve roots			P value
	Inferior (n = 7), mean ± SD	Superior (n = 30), mean ± SD	Inferior + Superior (n = 18), mean ± SD
Relative length of redundant nerve roots	2.07 ± 0.67 (a)1	2.95 ± 1.09 (a)	4.66 ± 0.73 (b)	< 0.001
Cross sectional area (mm2)	49.27 ± 8.06 (a)	35.61 ± 9.78 (b)	46.77 ± 14.73 (a)	0.001

¹One-way ANOVA test was used for statistical comparisons. The means with the same letters (a or b) in the same line are not significantly different. SD: Standard deviation.