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. 2017 Jan 11;159(4):627–631. doi: 10.1007/s00701-016-3063-2

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — The variability in clinical practice amongst consultants. a The absolute numbers of operations with subdural drain in relation with the total number of burr-hole operations performed for CSDH. b The re-operation rates are plotted against subdural drain usage for each consultant. There is a trend towards lower re-operation amongst consultants with higher subdural drain usage rates (R² = 0.27191)