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. 2017 Feb 28;12(2):e0172639. doi: 10.1371/journal.pone.0172639

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© 2017 Horrocks et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 3 — Boxes weighted by study size. Study size: Number of known MND cases for which a code was sought. Routine dataset: The routinely collected source of coded datasets. P: primary care data, H: hospital data, D: death certificate data. Heterogeneity measures: I² = 83%, Chi-squared = 23.0 (df = 4) p = 0.0001.