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. 2020 Aug 3;11(5):802–813. doi: 10.1177/2192568220941815

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© The Author(s) 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 License (https://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. — OLM alone: L3-4 versus L1-2 and L2-3.^a OLM, open laminectomy/laminotomy and microdiscectomy. ^a Pooled proportion across the studies was estimated with the inverse variance method with logit transformation, yielding weights.