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. 2022 Mar 9;12(3):e050305. doi: 10.1136/bmjopen-2021-050305

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Observed PTSD symptoms (PCL-5 total score) in participants at trial assessments. Scores are stratified by post-ICU patient and his/her spouse as well as by treatment group (iCBT/WL control group). Pertreatment condition, dyad membership is colour-coded. Higher PCL-5 scores indicate more severe symptoms. Note that one participant (former ICU patient in iCBT group) dropped out directly after randomisation. Values are provided for several time points (including approximately time specifications): screening (t0—4 weeks); t0, start of intervention (iCBT group)/waiting (WL control group); t1 (t0 +5 weeks), end of intervention (iCBT group)/waiting (WL control group). In the WL control group, the end of intervention is at t1+ (t1 +5 weeks). iCBT, internet-based cognitive-behavioural writing therapy; ICU, intensive care unit; PCL-5, PTSD Checklist for DSM-5; PTSD, post-traumatic stress disorder; WL, waitlist.