. Author manuscript; available in PMC: 2016 Apr 1.

Published in final edited form as: J Neurosurg Spine. 2015 Dec 18;24(4):644–651. doi: 10.3171/2015.7.SPINE15201

TABLE 5.

Results of the multivariate Cox regression analysis of local recurrence and survival over a 10-year period following resection

Variable	Local Recurrence
Variable	HR (95% CI)	p Value
Local recurrence
Age at surgery
Age/1 yr^*	1.01 (0.99–1.04)	0.375
Enneking appropriateness
EA	Reference	<0.001
EI	7.02 (2.96–16.6)	<0.001
Adjuvant therapy
No	Reference	0.848
Yes	0.94 (0.50–1.77)	0.848
Survival
Age at surgery
Age/1 yr^*	1.02 (0.99–1.04)	0.157
Enneking appropriateness
EA	Reference	0.249
EI	1.55 (0.74–3.27)	0.249
No. of vertebral levels spanned by the tumor
1	Reference	0.065
≥2	1.86 (0.96–3.58)	0.065
Adjuvant therapy
No	Reference	0.228
Yes	1.52 (0.77–2.99)	0.228

Age per 1-year increment.