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. 2014 Sep 5;2(1):52. doi: 10.1186/s40560-014-0052-5

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© Miyamoto et al.; licensee BioMed Central Ltd. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Time course of changes in the PaO ₂ /FiO ₂ ratio (PFR) during the first 40 h of prone positioning (PP). Analysis of variance (ANOVA) was used to compare values among the various time points. Multiple comparisons were performed using Dunnett’s tests with baseline values (before PP; supine position) as reference values. The paired t-test was also used to compare the values at 8 h with those at 16 h. Supine represents immediately before starting prone positioning (*p < 0.05 vs. reference). SD standard deviation.