{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,2]],"date-time":"2025-10-02T01:00:19Z","timestamp":1759366819150,"version":"build-2065373602"},"reference-count":13,"publisher":"Ordem dos Medicos","issue":"10","license":[{"start":{"date-parts":[[2025,8,25]],"date-time":"2025-08-25T00:00:00Z","timestamp":1756080000000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Acta Med Port"],"abstract":"<jats:p>Introduction: The development and validation of reliable and valid instruments to assess chronic pain and its impact on daily functioning are crucial in both clinical and research settings. The aim of this study was to develop and validate the scale \u2018Physical Function Impact Index on Chronic Pain\u2019 \u2013 PFIICP, a novel 12-item questionnaire designed to evaluate the physical functional impact on chronic pain.Methods: A formative measurement model was used. In comparison with other established scales that have emotional, cognitive and social considerations, PFIICP is designed to be more objective, as it focuses only on the relationship between physical performance and the subject\u2019s pain. Results: Data were collected from n = 285 patients at baseline and n = 58 patients at follow-up (3 - 6 months later). Spearman\u2019s rho correlations between the 12 items ranged from 0.153 to 0.793, all statistically significant (p &lt; 0.05), indicating that each item contributes uniquely to the construct. The intraclass correlation coefficient (ICC) for test-retest reliability was 0.788 (95% CI: 0.731 - 0.833), demonstrating good stability over time. Convergent validity was supported by strong Pearson correlations with established measures, including the Brief Pain Inventory (BPI; r = 0.739, p &lt; 0.05) and the Pain Disability Index (PDI; r = 0.739, p &lt; 0.05). Conclusion: These findings suggest that the PFIICP is a robust tool for assessing the functional impact of chronic pain through a formative model approach.<\/jats:p>","DOI":"10.20344\/amp.23516","type":"journal-article","created":{"date-parts":[[2025,8,25]],"date-time":"2025-08-25T09:49:32Z","timestamp":1756115372000},"page":"629-634","source":"Crossref","is-referenced-by-count":0,"title":["Development and Validation of the \u201cPhysical Functional Impact Index on Chronic Pain\u201d (PFIICP): A Formative Model Approach"],"prefix":"10.20344","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3237-4977","authenticated-orcid":false,"given":"Filipe","family":"Antunes","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8755-5126","authenticated-orcid":false,"given":"Nuno","family":"Sousa","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6322-4923","authenticated-orcid":false,"given":"Pedro","family":"Teixeira","sequence":"additional","affiliation":[]}],"member":"8464","published-online":{"date-parts":[[2025,8,25]]},"reference":[{"key":"10252","doi-asserted-by":"publisher","DOI":"10.1016\/j.jpain.2012.05.012"},{"key":"10253","doi-asserted-by":"publisher","DOI":"10.1007\/s40122-021-00308-2"},{"key":"10254","doi-asserted-by":"publisher","DOI":"10.1080\/0963828031000137063"},{"key":"10255","unstructured":"Leit\u00e3o A. Classifica\u00e7\u00e3o internacional de funcionalidade, incapacidade e sa\u00fade (CIF). Lisboa: Direc\u00e7\u00e3o-Geral da Sa\u00fade; 2004."},{"key":"10256","doi-asserted-by":"publisher","DOI":"10.1037\/\/0033-2909.110.2.305"},{"key":"10257","doi-asserted-by":"publisher","DOI":"10.1509\/jmkr.38.2.269.18845"},{"key":"10258","unstructured":"Associa\u00e7\u00e3o Portuguesa para o Estudo da Dor. O que \u00e9 a dor?. [cited 2025 Apr 11]. Available from: https:\/\/www.aped-dor.org\/index.php\/sobre-a-dor\/definicoes."},{"key":"10259","unstructured":"World Health Organization. International classification of diseases, eleventh revision (ICD-11). [cited 2025 Apr 11]. Available from: https:\/\/icd.who.int\/browse11."},{"key":"10260","unstructured":"European Pain Fedreation. What is the definition of pain?. [cited 2025 Apr 11]. Available from: https:\/\/europeanpainfederation.eu\/history\/what-is-pain\/."},{"key":"10261","unstructured":"Cleeland C, Ryan M. Pain assessment: global use of the brief pain inventory. Ann Acad Med Singap.1994;23:129-38."},{"key":"10262","unstructured":"Azevedo LF, Costa Pereira A, Dias C, Agualusa L, Lemos L, Rom\u00e3o J, et al. Tradu\u00e7\u00e3o, adapta\u00e7\u00e3o cultural e estudo multic\u00eantrico de valida\u00e7\u00e3o de instrumentos para rastreio e avalia\u00e7\u00e3o do impacto da dor cr\u00f3nica. Dor. 2007;15:38-9."},{"key":"10263","unstructured":"Tait RC, Pollard CA. Pain disability index: psychometric and validity data. Arch Phys Med Rehabil. 1987;68:438-41."},{"key":"10264","doi-asserted-by":"publisher","DOI":"10.1037\/0021-9010.88.5.879"}],"container-title":["Acta M\u00e9dica Portuguesa"],"original-title":[],"link":[{"URL":"https:\/\/actamedicaportuguesa.com\/revista\/index.php\/amp\/article\/download\/23516\/15778","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/actamedicaportuguesa.com\/revista\/index.php\/amp\/article\/download\/23516\/15778","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T21:45:29Z","timestamp":1759355129000},"score":1,"resource":{"primary":{"URL":"https:\/\/actamedicaportuguesa.com\/revista\/index.php\/amp\/article\/view\/23516"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,8,25]]},"references-count":13,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2025,10,1]]}},"URL":"https:\/\/doi.org\/10.20344\/amp.23516","relation":{},"ISSN":["1646-0758","0870-399X"],"issn-type":[{"type":"electronic","value":"1646-0758"},{"type":"print","value":"0870-399X"}],"subject":[],"published":{"date-parts":[[2025,8,25]]}}}