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This study tested the psychometric properties of these scales in two samples of bereaved adults from the United Kingdom and the Republic of Ireland. Confirmatory factor analysis (CFA) was used to test the combined dimensionality and measurement invariance of the IAQ and IDQ across the United Kingdom (<jats:italic>n<\/jats:italic>\u2009=\u20091012) and Irish (<jats:italic>n<\/jats:italic>\u2009=\u20091011) samples. Differential item functioning (DIF) was tested using multiple indicator multiple cause (MIMIC) modelling while convergent validity was also assessed. CFA results supported a correlated two\u2010factor model in both samples. The MIMIC model showed that the IDQ item \u201cHad recurrent thoughts of death or suicide\u201d showed DIF and the effect was small. Internal reliability of the scales were high and convergent validity was supported. The prevalence of ICD\u201011 GAD was 18.6% and 16.1% and ICD\u201011 DD was 13.8% and 10.5% in the United Kingdom and Irish samples, respectively. Findings of the study provide support for the validity, measurement invariance, and reliability of the IAQ and IDQ among two bereaved national samples.<\/jats:p>","DOI":"10.1002\/cpp.2917","type":"journal-article","created":{"date-parts":[[2023,9,30]],"date-time":"2023-09-30T06:48:45Z","timestamp":1696056525000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Assessing the validity and reliability of the <scp>International Anxiety Questionnaire<\/scp> and the <scp>International Depression Questionnaire<\/scp> in two bereaved national samples"],"prefix":"10.1002","volume":"31","author":[{"given":"Philip","family":"Hyland","sequence":"first","affiliation":[{"name":"Department of Psychology Maynooth University  Maynooth Ireland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Enya","family":"Redican","sequence":"additional","affiliation":[{"name":"School of Psychology Ulster University  Ulster UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3002-0630","authenticated-orcid":false,"given":"Thanos","family":"Karatzias","sequence":"additional","affiliation":[{"name":"School of Health &amp; Social Care Napier University  Edinburgh UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Shevlin","sequence":"additional","affiliation":[{"name":"School of Psychology Ulster University  Ulster UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2023,9,29]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.yfrne.2014.05.004"},{"key":"e_1_2_10_3_1","doi-asserted-by":"crossref","unstructured":"Beck A. 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