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Adjusting for multiple covariates and comorbidities, multivariable Poisson regression was used to assess the association between COVID-19 severity and mental morbidities.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Compared with individuals without a diagnosis of COVID-19, patients recovering from COVID-19 had increased risk of depression (22.1% vs 16.2%; adjusted relative risk (aRR) 1.48, 95%\u2009CI 1.20 to 1.82) and PTSD (19.5% vs 15.6%; aRR 1.38, 95%\u2009CI 1.09 to 1.75) but not anxiety (13.1% vs 11.3%; aRR 1.24, 95%\u2009CI 0.93 to 1.64). Elevated relative risks were limited to patients recovering from COVID-19 that were 40 years or older and were particularly high among individuals with university education. Among patients recovering from COVID-19, symptoms of depression were particularly common among those in the highest, compared with the lowest tertile of influenza-like symptom burden (47.1% vs 5.8%; aRR 6.42, 95%\u2009CI 2.77 to 14.87), among patients confined to bed for 7\u2009days or longer compared with those never confined to bed (33.3% vs 10.9%; aRR 3.67, 95%\u2009CI 1.97 to 6.86) and among patients hospitalised for COVID-19 compared with those never admitted to hospital (48.1% vs 19.9%; aRR 2.72, 95%\u2009CI 1.67 to 4.44).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Severe disease course is associated with increased risk of depression and PTSD among patients recovering from COVID-19.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bmjopen-2021-049967","type":"journal-article","created":{"date-parts":[[2021,7,23]],"date-time":"2021-07-23T17:38:11Z","timestamp":1627061891000},"page":"e049967","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":11,"title":["Illness severity and risk of mental morbidities among patients recovering from COVID-19: a cross-sectional study in the Icelandic population"],"prefix":"10.1136","volume":"11","author":[{"given":"Karen S\u00f3l","family":"Saevarsd\u00f3ttir","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9439-3022","authenticated-orcid":false,"given":"Hildur 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