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We tested the role of two suggested underlying factors in GAD, interpersonal problems and negative metacognitive beliefs, as predictors of trait\u2010worry and trait\u2010anxiety.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The sample consisted of 56 patients with a primary diagnosis of GAD from a randomized controlled trial. We first estimated the proportion of variance lying between the higher level of the data structure to account for potential therapists' effects. Two hierarchical regression analyses were conducted testing change in interpersonal problems and negative metacognitive beliefs as predictors of change in trait\u2010worry and trait\u2010anxiety following treatment. Change in depression and anxiety symptoms was controlled.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Change in negative metacognitive beliefs was the strongest predictor of improvement of both trait\u2010worry and trait\u2010anxiety. Change in interpersonal problems was not a unique predictor of change in trait\u2010worry but did make a significant and unique contribution to trait\u2010anxiety.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Negative metacognitive beliefs may be important targets to improve trait\u2010worry and trait\u2010anxiety in GAD. Interpersonal problems may be relevant for trait\u2010anxiety but could also be a surface marker of higher order vulnerability factors. Implications for treatment are discussed.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cpp.2841","type":"journal-article","created":{"date-parts":[[2023,2,17]],"date-time":"2023-02-17T06:02:28Z","timestamp":1676613748000},"page":"842-851","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Change in interpersonal problems and metacognitive beliefs as predictors of improvement in patients with generalized anxiety disorder"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1232-5545","authenticated-orcid":false,"given":"Eivind R.","family":"Strand","sequence":"first","affiliation":[{"name":"Department of Psychology Norwegian University of Science and Technology  Trondheim Norway"},{"name":"Nidaros DPS St. Olavs Hospital  Trondheim Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Odin","family":"Hjemdal","sequence":"additional","affiliation":[{"name":"Department of Psychology Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frederick","family":"Anyan","sequence":"additional","affiliation":[{"name":"Department of Psychology Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8502-5079","authenticated-orcid":false,"given":"Henrik","family":"Nordahl","sequence":"additional","affiliation":[{"name":"Department of Psychology Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hans M.","family":"Nordahl","sequence":"additional","affiliation":[{"name":"\u00d8stmarka, Division of Psychiatry St. Olav's Hospital  Trondheim Norway"},{"name":"Department of Mental Health Norwegian University of Science and Technology  Trondheim Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,2,28]]},"reference":[{"key":"e_1_2_13_2_1","doi-asserted-by":"publisher","DOI":"10.1080\/00223891.1990.9674088"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.2307\/271083"},{"key":"e_1_2_13_4_1","doi-asserted-by":"publisher","DOI":"10.1176\/appi.books.9780890425596"},{"key":"e_1_2_13_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/jclp.20583"},{"key":"e_1_2_13_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/0272-7358(88)90050-5"},{"key":"e_1_2_13_7_1","doi-asserted-by":"publisher","DOI":"10.1001\/archpsyc.1961.01710120031004"},{"key":"e_1_2_13_8_1","first-page":"5","volume-title":"Worrying: Perspectives on theory, assessment and treatment","author":"Borkovec T. 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