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Rothmund M, Pilz MJ, Schlosser L, Arraras JI, Groenvold M, Holzner B, van Leeuwen M, Petersen MA, Schmidt H, Young T, Rose M, Cella D, Giesinger JM. Equipercentile equating of scores from common patient-reported outcome measures of physical function in patients with cancer. J Clin Epidemiol 2024; 165:111203. [PMID: 37918641 DOI: 10.1016/j.jclinepi.2023.10.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 10/21/2023] [Accepted: 10/24/2023] [Indexed: 11/04/2023]
Abstract
OBJECTIVE To provide equipercentile equating of physical function (PF) scores from frequently used patient-reported outcome measures (PROMs) in cancer patients to facilitate data pooling and comparisons. STUDY DESIGN AND SETTING Adult cancer patients from five European countries completed the European Organization for Research and Treatment of Cancer (EORTC) computer adaptive test (CAT) Core, EORTC Quality of Life Questionnaire Version 3.0 (QLQ-C30), Functional Assessment of Cancer Therapy - General (FACT-G), 36-item Short Form Health Survey (SF-36), and the Patient-Reported Outcomes Measurement Information System (PROMIS) Physical Function 20a short form. The R package "equate" was used to establish conversion tables of PF scores on those measures with a bivariate rank correlation of at least 0.75. RESULTS In total, 953 patients with cancer (mean age 58.9 years, 54.7% men) participated. Bivariate rank correlations between PF scores from the EORTC CAT Core, EORTC QLQ-C30, SF-36, and PROMIS were all above 0.85, but below 0.69 for the FACT-G. Conversion tables were established for all measures but the FACT-G. These tables indicate which score from one PROM best matches the score from another PROM and provide standard errors of converted scores. CONCLUSION Our analysis indicates that linking of PF scores from both EORTC measures (CAT and QLQ-C30) with PROMIS and SF-36 is possible, whereas the physical domain of the FACT-G seems to be different. The established conversion tables may be used for comparing results or pooling data from clinical studies using different PROMs.
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Affiliation(s)
- Maria Rothmund
- Department of Psychiatry, Psychotherapy, Psychosomatics, and Medical Psychology, University Clinic of Psychiatry II, Innsbruck Medical University, Anichstraße 35, A-6020 Innsbruck, Austria; Institute of Psychology, University of Innsbruck, Innrain 52, A-6020 Innsbruck, Austria
| | - Micha J Pilz
- Department of Psychiatry, Psychotherapy, Psychosomatics, and Medical Psychology, University Clinic of Psychiatry II, Innsbruck Medical University, Anichstraße 35, A-6020 Innsbruck, Austria
| | - Lisa Schlosser
- Data Lab Hell GmbH, Europastraße 2a, A-6170 Zirl, Austria
| | - Juan I Arraras
- Oncology Department, Hospital Universitario de Navarra, C/Irunlarrea 3, ES-31008 Pamplona, Spain
| | - Mogens Groenvold
- Palliative Care Research Unit, Department of Geriatrics and Palliative Medicine GP, Bispebjerg & Frederiksberg Hospital, University of Copenhagen, Bispebjerg bakke 23B, Copenhagen, Denmark; Department of Public Health, University of Copenhagen, Oester Farimagsgade 5, DK-1353 Copenhagen, Denmark
| | - Bernhard Holzner
- Department of Psychiatry, Psychotherapy, Psychosomatics, and Medical Psychology, University Clinic of Psychiatry I, Innsbruck Medical University, Anichstraße 35, A-6020 Innsbruck, Austria
| | - Marieke van Leeuwen
- Division of Psychosocial Research & Epidemiology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands
| | - Morten Aa Petersen
- Palliative Care Research Unit, Department of Geriatrics and Palliative Medicine GP, Bispebjerg & Frederiksberg Hospital, University of Copenhagen, Bispebjerg bakke 23B, Copenhagen, Denmark
| | - Heike Schmidt
- University Clinic and Outpatient Clinic for Radiotherapy and Institute of Health and Nursing Science, Medical Faculty of Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Teresa Young
- Supportive Oncology Research Team, East & North Hertfordshire NHS Trust incorporating Mount Vernon Cancer Centre, Northwood, Middlesex HA6 2RN, United Kingdom
| | - Matthias Rose
- Center for Patient-Centered Outcomes Research (CPCOR), Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - David Cella
- Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Johannes M Giesinger
- Department of Psychiatry, Psychotherapy, Psychosomatics, and Medical Psychology, University Clinic of Psychiatry II, Innsbruck Medical University, Anichstraße 35, A-6020 Innsbruck, Austria.
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