Journal
ANNALS OF THE RHEUMATIC DISEASES
Volume 74, Issue 1, Pages 104-107Publisher
BMJ PUBLISHING GROUP
DOI: 10.1136/annrheumdis-2013-204053
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Funding
- NIH [1U54AR057951]
- UCLA/DREW Project EXPORT, NIMHD [2P20MD000182]
- NATIONAL CANCER INSTITUTE [U2CCA186878] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ARTHRITIS AND MUSCULOSKELETAL AND SKIN DISEASES [U54AR057951] Funding Source: NIH RePORTER
- National Institute on Minority Health and Health Disparities [P20MD000182] Funding Source: NIH RePORTER
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Objective To estimate responsiveness (sensitivity to change) and minimally important difference (MID) for the Patient-Reported Outcomes Measurement Information System (PROMIS) 20-item physical functioning scale (PROMIS PF-20). Methods The PROMIS PF-20, short form 36 (SF-36) physical functioning scale, and Health Assessment Questionnaire (HAQ) were administered at baseline, and 6 and 12 months later to a sample of 451 persons with rheumatoid arthritis. A retrospective change (anchor) item was administered at the 12-month follow-up. We estimated responsiveness between 12 months and baseline, and between 12 months and 6 months using one-way analysis of variance F-statistics. We estimated the MID for the PROMIS PF-20 using prospective change for people reporting getting 'a little better' or 'a little worse' on the anchor item. Results F-statistics for prospective change on the PROMIS PF-20, SF-36 and HAQ by the anchor item over 12 and 6 months (in parentheses) were 16.64 (14.98), 12.20 (7.92) and 10.36 (12.90), respectively. The MID for the PROMIS PF-20 was 2 points (about 0.20 of an SD). Conclusions The PROMIS PF-20 is more responsive than two widely used ('legacy') measures. The MID is a small effect size. The measure can be useful for assessing physical functioning in clinical trials and observational studies.
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