Correction to: Spinal Cord

https://doi.org/10.1038/s41393-019-0370-5

published online 24 October 2019

In the original version of this article, one participant’s sex was assigned incorrectly. In Table 1, the number of males in the ‘Improvement’ group was misstated as ‘13 (81.3)’, instead of ‘12 (75)’, and the number of females was misstated as ‘3 (18.8)’, instead of ‘4 (25)’. As a result, the associated p-value has changed from ‘0.21’ to ‘0.39’. This has been corrected in both the PDF and HTML versions of the article.