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. 2018 Sep 10;18:92. doi: 10.1186/s12874-018-0552-4

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© The Author(s). 2018

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. 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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Fig. 1 — Map of instrument items, interview and rater assessments. In addition to formal interview questions, observational evidence was used to rate all domains. Orientation was assessed by questions regarding orientation to time and place. Sleep was assessed with a series of 6 questions about sleep quality in the last 24 h. The DSI (Delirium Symptom Interview) asked seven questions about distorted perceptions over the past 24 h. * Asterisked cognitive items are from the Montreal Cognitive Assessment (MoCA [23])