{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,10]],"date-time":"2026-03-10T18:34:42Z","timestamp":1773167682446,"version":"3.50.1"},"reference-count":59,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2024,11,6]],"date-time":"2024-11-06T00:00:00Z","timestamp":1730851200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Sleep"],"abstract":"<jats:sec><jats:title>Introduction<\/jats:title><jats:p>Identifying prognostic factors of treatment outcome may assist in customizing an intervention to a patient's needs. Hence, we conducted a secondary analysis of data from a randomized controlled trial to investigate the effectiveness of an internet-based cognitive behavioral therapy for insomnia (iCBT-I) to find patient characteristics that may predict the change of insomnia severity after treatment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and methods<\/jats:title><jats:p>In this exploratory analysis involving 94 chronic insomnia patients, we examined the predictive value of several self-reported measures, medical history, and sociodemographic variables to psychological distress with separate linear regression models. The main outcome was the Insomnia Severity Index score improvement from pre- to post-treatment<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The study found that duration of insomnia, <jats:italic>b<\/jats:italic> (<jats:italic>SE<\/jats:italic>) = \u22120.02 (0.01), <jats:italic>p<\/jats:italic> = 0.01, and attitudes about the expected treatment success, <jats:italic>b<\/jats:italic> (<jats:italic>SE<\/jats:italic>) = 0.80 (0.27), <jats:italic>p<\/jats:italic> = 0.004, were predictors of a better outcome. Moreover, a better outcome was associated with a lower level of the following traits: attention seeking, <jats:italic>b<\/jats:italic> (<jats:italic>SE<\/jats:italic>) = \u22121.06 (0.51), <jats:italic>p<\/jats:italic> = 0.04; grandiosity, <jats:italic>b<\/jats:italic> (<jats:italic>SE<\/jats:italic>) = \u22121.50 (0.57), <jats:italic>p<\/jats:italic> = 0.01; distractibility, <jats:italic>b<\/jats:italic> (<jats:italic>SE<\/jats:italic>) = \u22121.57 (0.75), <jats:italic>p<\/jats:italic> = 0.04; and rigid perfectionism, <jats:italic>b<\/jats:italic> (<jats:italic>SE<\/jats:italic>) = \u22121.32 (0.65), <jats:italic>p<\/jats:italic> = 0.05.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Our results suggest that iCBT-I might be particularly beneficial for patients with higher expectations from the therapy and those who have a shorter duration of insomnia. Some pronounced personality traits, such as attention seeking, grandiosity, distractibility, and rigid perfectionism, may predict worse outcomes. However, because this was a <jats:italic>post-hoc<\/jats:italic> analysis, our results must be considered exploratory and verified in further studies.<\/jats:p><\/jats:sec><jats:sec><jats:title>Clinical trial registration<\/jats:title><jats:p><jats:ext-link>https:\/\/clinicaltrials.gov\/study\/NCT04300218?cond=NCT04300218&amp;amp;rank=1<\/jats:ext-link>, Identifier NCT04300218.<\/jats:p><\/jats:sec>","DOI":"10.3389\/frsle.2024.1415077","type":"journal-article","created":{"date-parts":[[2024,11,6]],"date-time":"2024-11-06T04:47:32Z","timestamp":1730868452000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Duration of insomnia and success expectancy predict treatment outcome of iCBT for insomnia"],"prefix":"10.3389","volume":"3","author":[{"given":"Polina","family":"Pchelina","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mikhail","family":"Poluektov","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2024,11,6]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"e14031","DOI":"10.1111\/jsr.14031","article-title":"Personality and insomnia: a systematic review and narrative synthesis","volume":"32","author":"Akram","year":"2023","journal-title":"J. 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