{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T00:18:43Z","timestamp":1792023523222,"version":"4.4.0"},"reference-count":31,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2023,1,13]],"date-time":"2023-01-13T00:00:00Z","timestamp":1673568000000},"content-version":"vor","delay-in-days":1748,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100012068","name":"Health and Care Research Wales","doi-asserted-by":"publisher","award":["HF 14-08"],"award-info":[{"award-number":["HF 14-08"]}],"id":[{"id":"10.13039\/100012068","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2018,4,1]]},"abstract":"<jats:title>Summary<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Epidemiology data regarding hidradenitis suppurativa (HS) are conflicting and prevalence estimates vary 80-fold, from 0\u00b705% in a population-based study to 4%.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>To assess the hypothesis that previous population-based studies underestimated true HS prevalence by missing undiagnosed cases.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We performed a population-based observational and case\u2013control study using the U.K. Clinical Practice Research Datalink (CPRD) linked to hospital episode statistics data. Physician-diagnosed cases in the CPRD were identified from specific Read codes. Algorithms identified unrecognized \u2018proxy\u2019 cases, with at least five Read code records for boils in flexural skin sites. Validation of proxy cases was undertaken with general practitioner (GP) questionnaires to confirm criteria-diagnosed cases. A case\u2013control study assessed disease associations.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>On 30 June 2013, 23 353 physician-diagnosed HS cases were documented in 4 364 308 research-standard records. In total, 68 890 proxy cases were identified, reduced to 10 146 criteria-diagnosed cases after validation, extrapolated from 107 completed questionnaires (61% return rate). Overall point prevalence was 0\u00b777% [95% confidence interval (CI) 0\u00b776\u20130\u00b778%]. An additional 18 417 cases had a history of one to four flexural skin boils. In physician-diagnosed cases, odds ratios (ORs) for current smoker and obesity (body mass index &amp;gt; 30 kg m-2) were 3\u00b761 (95% CI 3\u00b744\u20133\u00b779) and 3\u00b729 (95% CI 3\u00b714\u20133\u00b745). HS was associated with type 2 diabetes, Crohn disease, hyperlipidaemia, acne and depression, and not associated with ulcerative colitis or polycystic ovary syndrome.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Contrary to results of previous population-based studies, HS is relatively common, with a U.K. prevalence of 0\u00b777%, one-third being unrecognized, criteria-diagnosed cases using the most stringent disease definition. If individuals with probable cases are included, HS prevalence rises to 1\u00b719%.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/bjd.16101","type":"journal-article","created":{"date-parts":[[2017,11,1]],"date-time":"2017-11-01T22:42:40Z","timestamp":1509576160000},"page":"917-924","source":"Crossref","is-referenced-by-count":217,"title":["Population-based Clinical Practice Research Datalink study using algorithm modelling to identify the true burden of hidradenitis suppurativa"],"prefix":"10.1093","volume":"178","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5257-1142","authenticated-orcid":false,"given":"J.R.","family":"Ingram","sequence":"first","affiliation":[{"name":"Department of Dermatology & Academic Wound Healing Division of Infection and Immunity Cardiff University Cardiff CF14 4XN U.K"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S.","family":"Jenkins-Jones","sequence":"additional","affiliation":[{"name":"Pharmatelligence Cardiff CF14 3QX U.K"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.W.","family":"Knipe","sequence":"additional","affiliation":[{"name":"School of Social and Community Medicine University of Bristol Bristol BS8 2PS U.K"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.L.I.","family":"Morgan","sequence":"additional","affiliation":[{"name":"Pharmatelligence Cardiff CF14 3QX U.K"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"Cannings-John","sequence":"additional","affiliation":[{"name":"Centre for Trials Research College of Biomedical and Life Sciences Cardiff University Cardiff CF14 4XN U.K"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"V.","family":"Piguet","sequence":"additional","affiliation":[{"name":"Department of Dermatology & Academic Wound Healing Division of Infection and Immunity Cardiff University Cardiff CF14 4XN U.K"},{"name":"Division of Dermatology Women's College Hospital Toronto Canada"},{"name":"Department of Medicine University of Toronto Toronto Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2018,4,1]]},"reference":[{"key":"2023011315471346100_bjd16101-bib-0001","doi-asserted-by":"crossref","first-page":"222","DOI":"10.2340\/00015555-2129","article-title":"Disutility in patients with hidradenitis suppurativa: a cross-sectional study using EuroQoL-5D","volume":"96","author":"Riis","year":"2016","journal-title":"Acta Derm Venereol"},{"key":"2023011315471346100_bjd16101-bib-0002","first-page":"167","article-title":"A systematic literature review to compare quality of life in psoriasis with other chronic diseases using EQ-5D-derived utility values","volume":"6","author":"M\u00f8ller","year":"2015","journal-title":"Patient Relat Outcome Meas"},{"key":"2023011315471346100_bjd16101-bib-0003","doi-asserted-by":"crossref","first-page":"158","DOI":"10.1056\/NEJMcp1014163","article-title":"Clinical practice. 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