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Reliability was evaluated based on test\u2010retest reliability results and internal consistency; validity was evaluated on the basis of concurrent and known\u2010group validity.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 105 patients completed the online questionnaire. Intra\u2010class correlation coefficients for test\u2010retest were 0.91 for the <jats:styled-content style=\"fixed-case\">JFIQR<\/jats:styled-content> total score with a range of 0.84\u20130.90 in three domains: function, overall impact and symptoms. Internal consistency results indicated a Cronbach's alpha of 0.90 for the total score with a range of 0.83 and 0.85 for the domains. Concurrent validity results showed that the total score was correlated to all external criteria (Japanese version of the Fibromyalgia Impact Questionnaire, Fibromyalgia Activity Scale\u201031, Medical Outcomes Study 36\u2010item Short\u2010Form health survey) from a moderate to strong degree with most indicating a strong correlation. Results of known\u2010group validity showed that the <jats:styled-content style=\"fixed-case\">JFIQR<\/jats:styled-content> total score is capable of discriminating between <jats:styled-content style=\"fixed-case\">FM<\/jats:styled-content> and the other groups, such as rheumatic arthritis and no chronic pain (<jats:italic>P\u00a0<\/jats:italic>&lt;<jats:italic>\u00a0<\/jats:italic>0.0001 for all pairwise comparisons).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The current psychometric assessment of the <jats:styled-content style=\"fixed-case\">JFIQR<\/jats:styled-content> demonstrated that it is a reliable and valid questionnaire in Japanese patients with <jats:styled-content style=\"fixed-case\">FM<\/jats:styled-content>. Usefulness of the <jats:styled-content style=\"fixed-case\">JFIQR<\/jats:styled-content> in clinical studies and medical practice for Japanese\u2010speaking populations is expected.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1756-185x.12574","type":"journal-article","created":{"date-parts":[[2015,5,4]],"date-time":"2015-05-04T14:14:46Z","timestamp":1430748886000},"page":"1088-1094","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Psychometric assessment of the Japanese version of the Revised Fibromyalgia Impact Questionnaire: reliability and validity"],"prefix":"10.1111","volume":"20","author":[{"given":"Tatsuya","family":"Isomura","sequence":"first","affiliation":[{"name":"Clinical Study Support Inc. Nagoya Japan"},{"name":"Institute of Medical Science Tokyo Medical University Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ikuro","family":"Nakamura","sequence":"additional","affiliation":[{"name":"Research Center for Rheumatic Disease Toranomonkai Medical Corporation Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mika","family":"Kawaguchi","sequence":"additional","affiliation":[{"name":"Institute of Medical Science Tokyo Medical University Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emiko","family":"Sato","sequence":"additional","affiliation":[{"name":"Institute of Medical Science Tokyo Medical University Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kyoko","family":"Inuzuka","sequence":"additional","affiliation":[{"name":"Institute of Medical Science Tokyo Medical University Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenichi","family":"Osada","sequence":"additional","affiliation":[{"name":"Department of Neuropsychiatry St. Marianna University School of Medicine Kawasaki Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenya","family":"Nishioka","sequence":"additional","affiliation":[{"name":"Department of Neurology Juntendo University School of Medicine Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuhiro","family":"Hayakawa","sequence":"additional","affiliation":[{"name":"Pfizer Japan Inc. Tokyo Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2015,5,4]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/acr.20140"},{"key":"e_1_2_7_3_1","doi-asserted-by":"publisher","DOI":"10.1007\/s11916-001-0021-2"},{"key":"e_1_2_7_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/art.23177"},{"key":"e_1_2_7_5_1","volume-title":"Practice Guidelines for Fibromyalgia 2013","author":"Japan College of Fibromyalgia Investigation","year":"2013"},{"key":"e_1_2_7_6_1","first-page":"35","article-title":"The epidemiological findings of fibromyalgia","volume":"24","author":"Matsumoto Y","year":"2006","journal-title":"Pharma Medica"},{"key":"e_1_2_7_7_1","doi-asserted-by":"publisher","DOI":"10.2169\/naika.94.2139"},{"key":"e_1_2_7_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/acr.22277"},{"key":"e_1_2_7_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pec.2008.06.005"},{"key":"e_1_2_7_10_1","doi-asserted-by":"publisher","DOI":"10.1186\/ar2830"},{"key":"e_1_2_7_11_1","first-page":"728","article-title":"The fibromyalgia impact questionnaire: development and validation","volume":"18","author":"Burckhardt CS","year":"1991","journal-title":"J Rheumatol"},{"key":"e_1_2_7_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1756-185X.2010.01585.x"},{"key":"e_1_2_7_13_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10067-013-2259-6"},{"key":"e_1_2_7_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00296-011-2331-y"},{"key":"e_1_2_7_15_1","doi-asserted-by":"publisher","DOI":"10.1186\/1477-7525-11-132"},{"key":"e_1_2_7_16_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10067-010-1546-8"},{"key":"e_1_2_7_17_1","first-page":"35","article-title":"Development of the Japanese version of the Revised Fibromyalgia Impact Questionnaire (JFIQR): translation and linguistic validation","volume":"26","author":"Isomura T","year":"2014","journal-title":"Clin Rheumatol"},{"key":"e_1_2_7_18_1","unstructured":"NishiokaK NakamuraI UsuiC YamanoY OsadaK NishiokaK(2012)Clinical assessment of fibromyalgia utilizing FAS\u201031. 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