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. 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

Fig. 2.

Fig. 2

Kaplan-Meier analysis of survival following surgery. The number at risk indicates the number of EA and EI patients included in the analysis. Median survival was reached at 8.4 years postoperatively for EA patients and 6.4 years postoperatively for EI patients.