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. 2015 Jul 1;23:50. doi: 10.1186/s13049-015-0116-0

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© Hyldmo et al. 2015

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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We included 20 studies with a total of 34 comparisons in the meta-analysis. Some of the studies reported data from more than one group: REM-sleep^{1, 6}; non-REM sleep^{3, 5}; positional obstructive sleep apnea (OSA)^{2, 4, 18}; non-positional OSA^{7, 8}; with tonsillo-andenomegaly⁹; with adenoid hypertrophy¹⁷; no obstruction¹⁵; at 40-44 weeks post-conseptional age¹⁶; at 45-49 weeks post-conseptional age¹⁴; at 50-54 weeks post-conseptional age¹⁰; at 55-59 weeks post-conseptional age¹²; left lateral vs. supine position¹¹; right lateral vs. supine position¹³; preoperative night¹⁸, first¹⁹ and third²⁰ postoperative night.