{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,18]],"date-time":"2026-04-18T05:05:21Z","timestamp":1776488721411,"version":"3.51.2"},"reference-count":21,"publisher":"Scientific Scholar","content-domain":{"domain":["ijdvl.com"],"crossmark-restriction":true},"short-container-title":["IJDVL"],"abstract":"<jats:sec>\n<jats:title>Background<\/jats:title>\n<jats:p>The Dermatology Life Quality Index (DLQI) is a valuable tool for assessing the quality of life in adult patients with psoriasis.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>Aims<\/jats:title>\n<jats:p>To analyse the reliability and validity of the DLQI to measure the quality of life in patients with mild to moderate-severe psoriasis.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>Methods<\/jats:title>\n<jats:p>This was a secondary validation study nested in a follow-up study. The Rasch-Andrich model was utilised to perform response function, item and person fit, differential item functioning, dimensionality, and reliability analyses.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>Results<\/jats:title>\n<jats:p>A total of 1439 patients were analysed, 52.1% male, mean age of 48.7 years (SD 16.1). Psoriasis vulgaris was the phenotype in 43.1% of patients, and 86% had a mild Psoriasis Area Severity Index (PASI). Adequate adjustment of the response function and the items was observed in the best-fit sample, except for item 7 (work and study). The measure explained 60.9% of the variance and presented a reliability of 0.86. Differential item functioning was identified by age, with a relevant bias in the estimation for older adults. Item-person maps are provided.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>Limitations<\/jats:title>\n<jats:p>This study was performed at a single centre, with most patients presenting a mild PASI score, limiting generalisation of the findings.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>Conclusion<\/jats:title>\n<jats:p>The validity evidence favours the use of the DLQI in moderate-severe psoriasis. However, the instrument biases the estimate of older adults. This population group should consider a specific version of the instrument.<\/jats:p>\n<\/jats:sec>","DOI":"10.25259\/ijdvl_271_2022","type":"journal-article","created":{"date-parts":[[2024,1,6]],"date-time":"2024-01-06T10:22:31Z","timestamp":1704536551000},"page":"433-439","update-policy":"https:\/\/doi.org\/10.25259\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Rasch analysis of the dermatology life quality index (DLQI) in patients with mild to moderate-severe psoriasis"],"prefix":"10.25259","volume":"90","author":[{"given":"Juliana","family":"Madrigal-Cadavid","sequence":"first","affiliation":[{"name":"Pharmacoepidemiology and Health Risk Management Research Group, Medellin-Colombia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jorge","family":"Estrada-Acevedo","sequence":"additional","affiliation":[{"name":"Pharmacoepidemiology and Health Risk Management Research Group, Medellin-Colombia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ana","family":"Maria Jaramillo","sequence":"additional","affiliation":[{"name":"School of Medicine, CES University, Medellin-Colombia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura","family":"Jaramillo-Santacoloma","sequence":"additional","affiliation":[{"name":"School of Medicine, CES University, Medellin-Colombia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Simon","family":"Guarin","sequence":"additional","affiliation":[{"name":"School of Medicine, CES University, Medellin-Colombia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Angela","family":"Londo\u00f1o","sequence":"additional","affiliation":[{"name":"Dermatology Research Group, CES University, Medellin-Colombia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Diego","family":"Rojas-Gualdron","sequence":"additional","affiliation":[{"name":"School of Medicine, CES University, Medellin-Colombia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"10894","published-online":{"date-parts":[[2024,1,6]]},"reference":[{"key":"10.25259\/IJDVL_271_2022\/ref-1","doi-asserted-by":"publisher","first-page":"685","DOI":"10.1586\/14737167.2014.933671","article-title":"The economic burden of psoriasis: A systematic literature review","volume":"14","author":"Feldman","year":"2014","journal-title":"Expert Rev Pharmacoecon Outcomes Res"},{"key":"10.25259\/IJDVL_271_2022\/ref-2","doi-asserted-by":"publisher","first-page":"577","DOI":"10.1016\/j.ad.2016.04.018","article-title":"Coste de la psoriasis y artritis psori\u00e1sica en cinco pa\u00edses de Europa: una revisi\u00f3n sistem\u00e1tica","volume":"107","author":"Burgos-Pol","year":"2016","journal-title":"Actas Dermosifiliogr"},{"key":"10.25259\/IJDVL_271_2022\/ref-3","doi-asserted-by":"crossref","first-page":"467","DOI":"10.17533\/udea.iatreia.13662","article-title":"Instrumentos de evaluaci\u00f3n de la calidad de vida en dermatolog\u00eda","volume":"26","author":"Restrepo","year":"2013","journal-title":"Iatreia"},{"key":"10.25259\/IJDVL_271_2022\/ref-4","doi-asserted-by":"publisher","first-page":"17","DOI":"10.1111\/j.1468-3083.2009.03563.x","article-title":"What are the best outcome measures for assessing quality of life in plaque type psoriasis? 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