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The aim of this study was to conduct a preliminary evaluation of a mobile-app-delivered, cognitive behavioral treatment (CBT)-based intervention in helping adults self-manage fibromyalgia symptoms. A total of 100 adults with FMS (M [SD] age = 49.81, [9.99] years; 94% women) were given access to the digital treatment program and downloaded the app. Pain severity, anxiety symptoms, depression symptoms, fatigue, and sleep quality were assessed at pre-treatment, post-treatment, and 3-month follow-up. Fifty-three of the potential participants completed the 47-day treatment. Data showed significant improvements in pain severity (p = 0.007, d = 0.43), anxiety (p = 0.011, d = 0.40) and depressive symptoms (p = 0.001, d = 0.50) from pre-treatment to post-treatment. The effect sizes associated with app use are consistent with improvements seen in previously published clinical trials of CBT for FMS. Improvements were generally maintained, although there was some decrease in the outcomes from post-treatment to the 3-month follow-up. Most participants reported that they were very satisfied with the app. The use of the app was associated with similar levels of improvements found with in-person CBT treatment for FMS. Research to evaluate the effectiveness of the app in a controlled trial is warranted.<\/jats:p>","DOI":"10.3390\/ijerph191912026","type":"journal-article","created":{"date-parts":[[2022,9,23]],"date-time":"2022-09-23T04:07:07Z","timestamp":1663906027000},"page":"12026","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["A Mobile Application to Help Self-Manage Pain Severity, Anxiety, and Depressive Symptoms in Patients with Fibromyalgia Syndrome: A Pilot Study"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1998-6653","authenticated-orcid":false,"given":"Jordi","family":"Mir\u00f3","sequence":"first","affiliation":[{"name":"Universitat Rovira i Virgili, Carretera de Valls, 43007 Tarragona, Spain"},{"name":"Unit for the Study and Treatment of Pain\u2014ALGOS, Research Center for Behavior Assessment (CRAMC), Department of Psychology, Institut d\u2019Investigaci\u00f3 Sanit\u00e0ria Pere Virgili, 43007 Tarragona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meritxell","family":"Lleix\u00e0-Daga","sequence":"additional","affiliation":[{"name":"Universitat Rovira i Virgili, Carretera de Valls, 43007 Tarragona, Spain"},{"name":"Unit for the Study and Treatment of Pain\u2014ALGOS, Research Center for Behavior Assessment (CRAMC), Department of Psychology, Institut d\u2019Investigaci\u00f3 Sanit\u00e0ria Pere Virgili, 43007 Tarragona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2517-6948","authenticated-orcid":false,"given":"Roc\u00edo","family":"de la Vega","sequence":"additional","affiliation":[{"name":"Faculty of Psychology, Andaluc\u00eda Tech. Campus de Teatinos, Universidad de M\u00e1laga, 29071 M\u00e1laga, Spain"},{"name":"Biomedical Research Institute of M\u00e1laga (IBIMA), Avda. Jorge Luis Borges n\u00b015, Bl.3 Pl.3, 29010 M\u00e1laga, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3073-7885","authenticated-orcid":false,"given":"Pere","family":"Llorens-Vernet","sequence":"additional","affiliation":[{"name":"Universitat Rovira i Virgili, Carretera de Valls, 43007 Tarragona, Spain"},{"name":"Unit for the Study and Treatment of Pain\u2014ALGOS, Research Center for Behavior Assessment (CRAMC), Department of Psychology, Institut d\u2019Investigaci\u00f3 Sanit\u00e0ria Pere Virgili, 43007 Tarragona, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark P.","family":"Jensen","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation Medicine, University of Washington, Seattle, WA 98195, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,9,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"645","DOI":"10.1038\/s41584-020-00506-w","article-title":"Fibromyalgia: An update on clinical characteristics, aetiopathogenesis and treatment","volume":"16","author":"Giorgi","year":"2020","journal-title":"Nat. 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