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. 2017 Sep 22;8(3):244–253. doi: 10.1177/2192568217722562

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (http://www.creativecommons.org/licenses/by-nc-nd/4.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — Average age of cervical spondylotic myelopathy (CSM) patients undergoing anterior cervical fusion (ACF) and posterior cervical fusion (PCF). The trends in the average age of CSM patients undergoing ACF and PCF are shown. PCF patients were significantly older than ACF patients (P < .01). Data from 2003 was compared to data from 2013 by procedure to determine statistically significant changes over time. A “*” denotes statistical significance with P < .01. A “**” represents statistical significance with P < .001.