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Database (MEDLINE, EMBASE, CINAHL, PsychINFO) searches were conducted according to PRISMA. The risk of bias was assessed using the Appraisal tool for Cross-Sectional Studies. The database searches yielded 2982 results. Eight cross-sectional studies from Western Europe were included, with 1201 participants. The prevalence of mental disorders varied between studies: depression from 8 to 86%; anxiety from 3.1 to 81%; and post-traumatic stress disorder (PTSD) from 3.4 to 57.6%. The studies had methodological flaws; in particular a risk of unrepresentative samples. There was methodological heterogeneity, therefore pooling of data, and direct comparisons were not possible. The majority of studies found higher rates of depression, anxiety and PTSD than previous estimates for the general population, and higher rates of depression and anxiety than previous estimates for other migrant groups.<\/jats:p>","DOI":"10.1007\/s10903-022-01379-9","type":"journal-article","created":{"date-parts":[[2022,7,15]],"date-time":"2022-07-15T04:02:51Z","timestamp":1657857771000},"page":"427-435","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["The Mental Health of Adult Irregular Migrants to Europe: A Systematic Review"],"prefix":"10.1007","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9345-0814","authenticated-orcid":false,"given":"Fiona","family":"Martin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. 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Accessed 20 March 2021."},{"key":"1379_CR5","unstructured":"International Organization for Migration. World Migration Report 2020. 2019 (https:\/\/publications.iom.int\/system\/files\/pdf\/wmr_2020.pdf). Accessed 5 February 2021"},{"key":"1379_CR6","unstructured":"United Nations. Migration. 2021b (https:\/\/www.un.org\/en\/sections\/issues-depth\/migration\/index.html) Accessed 11 February 2021"},{"key":"1379_CR7","unstructured":"World Health Organisation. Public health aspects of mental health among migrants and refugees: a review of the evidence on mental health care for refugees, asylum seekers and irregular migrants in the WHO European region. 2016. 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