Correction to: Spinal Cord (2016) 54, 628–639; doi:10.1038/sc.2016.31; published online 12 April 2016

Since the publication of this article, the authors have become aware of two mistakes. Firstly, the data presented in one of the included studies (McBain et al. (2013)1) was wrongly interpreted as a s.d. rather than a s.e.m. Secondly, there was an error in the equation used to determine the Glass’s delta values, which slightly affected all calculations.

The authors apologise for any inconvenience caused.