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A Portuguese version of the <jats:styled-content style=\"fixed-case\">PBPI<\/jats:styled-content> (<jats:styled-content style=\"fixed-case\">PBPI<\/jats:styled-content>\u2010P) was created through a process of translation, back translation, and expert panel evaluation. The <jats:styled-content style=\"fixed-case\">PBPI<\/jats:styled-content>\u2010P was administered to a total of 122 patients from 13 chronic pain clinics in Portugal, at baseline and after 7\u00a0days. Internal consistency and test\u2013retest reliability were assessed by Cronbach's alpha (\u03b1) and intraclass correlation coefficient (<jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>). Construct (convergent and discriminant) validity was assessed based on a set of previously developed theoretical hypotheses about interrelations between the <jats:styled-content style=\"fixed-case\">PBPI<\/jats:styled-content>\u2010P and other measures. Exploratory and confirmatory factor analyses were performed to test the theoretical structure of the <jats:styled-content style=\"fixed-case\">PBPI<\/jats:styled-content>\u2010P.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The internal consistency and test\u2013retest reliability coefficients for each respective subscale were \u03b1\u00a0=\u00a00.620 and <jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>\u00a0=\u00a00.801 for mystery; \u03b1\u00a0=\u00a00.744 and <jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>\u00a0=\u00a00.841 for permanence; \u03b1\u00a0=\u00a00.778 and <jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>\u00a0=\u00a00.791 for constancy; and \u03b1\u00a0=\u00a00.764 and <jats:styled-content style=\"fixed-case\">ICC<\/jats:styled-content>\u00a0=\u00a00.881 for self\u2010blame. Exploratory and confirmatory factor analysis revealed a four\u2010factor structure (performance, constancy, self\u2010blame, and mystery) that explained 63% of the variance. The construct validity of the <jats:styled-content style=\"fixed-case\">PBPI<\/jats:styled-content>\u2010P was shown to be adequate, with more than 90% of the previously defined hypotheses regarding interrelations with other measures confirmed.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The <jats:styled-content style=\"fixed-case\">PBPI<\/jats:styled-content>\u2010P has been shown to be adequate and to have excellent reliability, internal consistency, and validity. It may contribute to a better pain assessment and is suitable for research and clinical use.<\/jats:p><\/jats:sec>","DOI":"10.1111\/papr.12529","type":"journal-article","created":{"date-parts":[[2016,10,22]],"date-time":"2016-10-22T14:36:40Z","timestamp":1477147000000},"page":"808-819","source":"Crossref","is-referenced-by-count":9,"title":["Portuguese Version of the Pain Beliefs and Perceptions Inventory: A Multicenter Validation Study"],"prefix":"10.1111","volume":"17","author":[{"given":"Lu\u00eds Filipe","family":"Azevedo","sequence":"first","affiliation":[{"name":"Department of Health Information and Decision Sciences (CIDES) Faculty of Medicine University of Porto Porto Portugal"},{"name":"CINTESIS \u2013 Centre for Health Technology and Services Research University of Porto Porto Portugal"},{"name":"National Observatory of Pain \u2013 NOPain (OBSERVDOR) Faculty of Medicine University of Porto Porto Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rute","family":"Sampaio","sequence":"additional","affiliation":[{"name":"Department of Experimental Biology Faculty of Medicine University of Porto Porto Portugal"},{"name":"IBMC \u2013 Institute for Molecular and Cell Biology University of Porto Porto Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cl\u00e1udia","family":"Camila Dias","sequence":"additional","affiliation":[{"name":"Department of Health Information and Decision Sciences (CIDES) Faculty of Medicine University of Porto Porto Portugal"},{"name":"CINTESIS \u2013 Centre for Health Technology and Services Research University of Porto Porto Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jos\u00e9","family":"Rom\u00e3o","sequence":"additional","affiliation":[{"name":"Pain Medicine Unit Department of Anesthesiology Porto Hospital Center (Centro Hospitalar do porto, EPE) Porto Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laurinda","family":"Lemos","sequence":"additional","affiliation":[{"name":"Multidisciplinary Chronic Pain Management Unit and Department of Anesthesiology Senhora da Oliveira Hospital Guimaraes (Centro Hospitalar Alto Ave EPE \u2013 Guimaraes) Guimaraes Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lu\u00eds","family":"Agualusa","sequence":"additional","affiliation":[{"name":"Pain Medicine Unit Pedro Hispano Hospital (Unidade Local de Sa\u015bde de Matosinhos EPE) Matosinhos Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S\u00edlvia","family":"Vaz\u2010Serra","sequence":"additional","affiliation":[{"name":"Pain Medicine Unit General Hospital Coimbra University Hospital Centre (Centro Hospitalar e Universit\u012frio de Coimbra EPE) Coimbra Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Teresa","family":"Patto","sequence":"additional","affiliation":[{"name":"Pain Medicine Unit Santo Ant\u00f3nio dos Capuchos Hospital \u2013 Lisboa Central Hospital Centre (Centro Hospitalar Lisboa Central, EPE) Lisboa Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Altamiro","family":"Costa\u2010Pereira","sequence":"additional","affiliation":[{"name":"Department of Health Information and Decision Sciences (CIDES) Faculty of Medicine University of Porto Porto Portugal"},{"name":"CINTESIS \u2013 Centre for Health Technology and Services Research University of Porto Porto Portugal"},{"name":"National Observatory of Pain \u2013 NOPain (OBSERVDOR) Faculty of Medicine University of Porto Porto Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jos\u00e9 Manuel","family":"Castro\u2010Lopes","sequence":"additional","affiliation":[{"name":"National Observatory of Pain \u2013 NOPain (OBSERVDOR) Faculty of Medicine University of Porto Porto Portugal"},{"name":"Department of Experimental Biology Faculty of Medicine University of Porto Porto Portugal"},{"name":"IBMC \u2013 Institute for Molecular and Cell Biology University of Porto Porto Portugal"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2016,12,30]]},"reference":[{"issue":"1","key":"e_1_2_8_2_1","first-page":"S1","article-title":"Subcommittee on Taxonomy of the International Association for the Study of Pain \u2013 \u201cClassification of chronic pain: descriptions of chronic pain syndromes and definitions of pain terms\u201d","volume":"24","author":"Merskey HE","year":"1986","journal-title":"Pain"},{"key":"e_1_2_8_3_1","unstructured":"The International Association for the Study of Pain.Classification of Chronic Pain.2nd ed. 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