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. 2015 Oct 12;25:1137–1149. doi: 10.1007/s11136-015-1152-y

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© The Author(s) 2015

Open AccessThis 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. 4 — Estimation results for sleep, depression, and breathing domains [main coefficients ( $β$ ) in left panel, threshold coefficients ( $γ$ ) in right panel, intercepts in threshold equation not shown]