Table 6.

Multi-factor analysis

Factor	B	S.E.	Wals	P	Exp (B)	95% C.I.
						Lower limit	Upper limit
Number of cone fractures	1.622	0.692	5.334	0.011	4.911	1.320	11.345
Percentage of height loss at the front edge of the injured vertebral body before surgery (%)	3.412	0.921	7.329	0.002	10.4552	2.872	16.592
SEP monitoring abnormality	2.579	0.752	6.287	0.003	9.021	1.923	14.423

SEP: somatosensory evoked potential.