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Julian Matthewman,1 Kathryn E Mansfield,1 Joseph F Hayes,2 Elizabeth I Adesanya,1 Catherine H Smith,3 Amanda Roberts,1 Sinéad M Langan,1 Alasdair D Henderson1 1Department of Non-Communicable Disease Epidemiology, London School of Hygiene and Tropical Medicine, London, UK; 2Division of Psychiatry, University College London, London, UK; 3St John’s Institute of Dermatology, Kings College London, London, UKCorrespondence: Julian Matthewman, Email julian.matthewman1@lshtm.ac.ukIntroduction: Previous research has shown associations between eczema and psoriasis and anxiety and depression. We investigated whether associations are consistent across different settings of ascertainment for depression and anxiety, including interview and survey responses from UK Biobank (a large longitudinal cohort recruiting individuals aged 40– 69 years between 2006– 2010), and linked primary care data, with the aim of drawing more reliable conclusions through triangulation.Methods: In cross-sectional studies, we estimated associations between eczema or psoriasis and anxiety or depression, defining anxiety or depression as 1) self-reported previous diagnosis at UK Biobank recruitment interview; 2) PHQ-9/GAD-7 score indicating depression or anxiety from a UK Biobank mental health follow-up survey in 2016; and 3) diagnosis in linked primary care electronic health record data.Results: We analysed 230,047 people with linked Biobank and primary care data. We found poor agreement between the data sources for eczema, psoriasis, anxiety, and depression. Eg, 9474 had a previous eczema diagnosis in primary care data, 4069 self-reported previous eczema diagnosis at the UK biobank interview, and 1536 had eczema in both data sources (for depression 40,455; 13,320; and 9588 respectively). Having eczema or psoriasis (recorded in primary care or baseline interview) was associated with higher odds of anxiety and depression. Eg, the adjusted odds ratio for depression comparing those with eczema to those without was greater than 1 when defining the outcome from 1) the recruitment interview (1.36, 95% confidence interval 1.27– 1.45); 2) the follow-up survey (1.24, 1.09– 1.39), and 3) primary care records (1.56, 1.50– 1.62).Discussion: Our findings support increased prevalence of mental illness in people with psoriasis and eczema across multiple data sources, which should be considered in planning of mental health services. However, we found poor agreement in disease ascertainment between settings, with implications for data interpretation in electronic health records.Keywords: eczema, psoriasis, anxiety, depression, ascertainment, cross-sectional study, data linkage, UK Biobank, electronic health records |
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