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Studies were included if they reported prepandemic and during\u2010pandemic psychiatric symptoms, using validated scales, in people with preexisting mood, anxiety, eating, or obsessive\u2010compulsive disorders. Two reviewers independently screened studies, extracted data, and assessed evidence certainty. Random\u2010effects meta\u2010analyses were conducted. Effect sizes were reported as standardized mean differences (SMDs) with 95% confidence intervals (CIs).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Eighteen studies from 10 countries were included. Of the 4465 included participants, 68% were female and the average age was 43\u2009years. Mood and obsessive\u2010compulsive disorders were the most studied disorders. During\u2010pandemic psychiatric measurements were usually collected during nationwide lockdown. Obsessive\u2010compulsive symptoms worsened among people with obsessive\u2010compulsive and related disorders, with a moderate effect size (<jats:italic>N<\/jats:italic>\u2009=\u2009474 [six studies], SMD\u2009=\u2009\u22120.45 [95% CI, \u22120.82 to \u22120.08], <jats:italic>I<\/jats:italic><jats:sup>2<\/jats:sup>\u2009=\u200983%; very low certainty). We found a small association between the COVID\u201019 pandemic and reduced anxiety symptoms in people with mood, anxiety, obsessive\u2010compulsive, and eating disorders (<jats:italic>N<\/jats:italic>\u2009=\u20093738 [six studies], SMD\u2009=\u20090.11 [95% CI, 0.02\u20130.19], <jats:italic>I<\/jats:italic><jats:sup>2<\/jats:sup>\u2009=\u200963%; very low certainty). No change in loneliness, depressive, or problematic eating symptoms was found.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>People with obsessive\u2010compulsive and related disorders may benefit from additional monitoring during the COVID\u201019 pandemic and possibly future pandemics. Other psychiatric symptoms were stable in people with the specific disorders studied. Overall, evidence certainty was very low.<\/jats:p><\/jats:sec>","DOI":"10.1111\/pcn.13582","type":"journal-article","created":{"date-parts":[[2023,8,11]],"date-time":"2023-08-11T12:13:55Z","timestamp":1691756035000},"page":"583-591","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Association between the <scp>COVID<\/scp>\u201019 pandemic and psychiatric symptoms in people with preexisting obsessive\u2010compulsive, eating, anxiety, and mood disorders: a systematic review and meta\u2010analysis of before\u2010after studies"],"prefix":"10.1111","volume":"77","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3823-8394","authenticated-orcid":false,"given":"Emma A","family":"van Reekum","sequence":"first","affiliation":[{"name":"Department of Psychiatry and Behavioural Neurosciences, Faculty of Health Sciences McMaster University  Hamilton Ontario Canada"},{"name":"Department of Health Research Methods, Evidence, and Impact, Faculty of Health Sciences McMaster University  Hamilton Ontario Canada"},{"name":"Population Health Research Institute McMaster University and Hamilton Health Sciences  Hamilton Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julia J","family":"Woo","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Behavioural Neurosciences, Faculty of Health Sciences McMaster University  Hamilton Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jo\u2010Anne","family":"Petropoulos","sequence":"additional","affiliation":[{"name":"Health Sciences Library, Faculty of Health Sciences McMaster University  Hamilton Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zainab","family":"Samaan","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Behavioural Neurosciences, Faculty of Health Sciences McMaster University  Hamilton Ontario Canada"},{"name":"Department of Health Research Methods, Evidence, and Impact, Faculty of Health Sciences McMaster University  Hamilton Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lawrence","family":"Mbuagbaw","sequence":"additional","affiliation":[{"name":"Department of Health Research Methods, Evidence, and Impact, Faculty of Health Sciences McMaster University  Hamilton Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,9,11]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/S2215-0366(22)00260-7"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamapsychiatry.2022.1067"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jad.2021.09.098"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jad.2021.11.031"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0140-6736(21)02143-7"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-021-03553-9"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12889-020-10070-3"},{"key":"e_1_2_10_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/S2215-0366(20)30462-4"},{"key":"e_1_2_10_10_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamapsychiatry.2021.1818"},{"key":"e_1_2_10_11_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamapsychiatry.2021.2274"},{"key":"e_1_2_10_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11920-021-01284-2"},{"key":"e_1_2_10_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/erv.2861"},{"key":"e_1_2_10_14_1","doi-asserted-by":"publisher","DOI":"10.1097\/01.psy.0000221254.77675.f5"},{"key":"e_1_2_10_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.comppsych.2010.09.006"},{"key":"e_1_2_10_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/da.21939"},{"key":"e_1_2_10_17_1","doi-asserted-by":"publisher","DOI":"10.1017\/S0033291712002395"},{"key":"e_1_2_10_18_1","doi-asserted-by":"publisher","DOI":"10.1002\/eat.20909"},{"key":"e_1_2_10_19_1","doi-asserted-by":"publisher","DOI":"10.1080\/16506073.2020.1812709"},{"key":"e_1_2_10_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmv.27549"},{"key":"e_1_2_10_21_1","doi-asserted-by":"publisher","DOI":"10.3390\/ijerph20020948"},{"key":"e_1_2_10_22_1","doi-asserted-by":"publisher","DOI":"10.1037\/amp0001005"},{"key":"e_1_2_10_23_1","doi-asserted-by":"publisher","DOI":"10.1186\/s12954-022-00712-7"},{"key":"e_1_2_10_24_1","doi-asserted-by":"publisher","DOI":"10.1136\/bmjopen-2020-040229"},{"key":"e_1_2_10_25_1","doi-asserted-by":"publisher","DOI":"10.1186\/s13256-021-03140-6"},{"key":"e_1_2_10_26_1","doi-asserted-by":"publisher","DOI":"10.1001\/jamasurg.2021.0522"},{"key":"e_1_2_10_27_1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890425596"},{"key":"e_1_2_10_28_1","unstructured":"2020 Canadian Agency for Drugs and Technologies in Health.CADTH COVID\u201019 Search Strings. 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