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. 2023 Feb 27;94(8):657–666. doi: 10.1136/jnnp-2022-330158

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© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Forest plot for the Oswestry Disability Index (ODI, measured on a scale of 0–100, where 100 indicates the most severe disability) at the 2-year follow-up. ‘Favours fusion’ means the ODI was lower (or improved more) in the decompression+fusion group.