A SYSTEMATIC REVIEW OF THE SF-36® HEALTH SURVEY FOR MEASURING HEALTH-RELATED QUALITY OF LIFE IN PATIENTS WITH ULCERATIVE COLITIS
Author(s)
Yarlas A1, Bayliss M1, Cappelleri JC2, Maher SM1, Bushmakin AG2, Chen LA3, Manuchehri A4, Healey P2, White MK1
1Optum, Lincoln, RI, USA, 2Pfizer Inc, Groton, CT, USA, 3New York University, New York, NY, USA, 4Pfizer Ltd, Tadworth, UK
OBJECTIVES: Ulcerative colitis (UC), an inflammatory bowel disease, substantially impacts patients’ health-related quality of life (HRQL). The SF-36® Health Survey (SF-36), a generic health status measure, quantifies the impact of UC on HRQL, though to-date there is no summary of evidence of its psychometric properties for this purpose. A systematic review of the literature evaluated the SF-36 as a valid and responsive measure of HRQL in UC. METHODS: We searched PubMed, EMBASE, Cochrane CENTRAL, and BIOSIS Weekly databases. Search terms included ‘ulcerative colitis’, ‘inflammatory bowel disease’, SF-36, and HRQL. English-language articles reporting SF-36 findings from UC-only samples were selected. When possible, SF-36 mean scale scores were extracted and converted to norm-based T-scores and summarized across studies. RESULTS: Fifty-nine articles meeting all criteria were reviewed. Evidence supported the following: (1) adequate internal consistency (Cronbach’s α≥0.70) and test-retest reliability (intraclass correlations ≥0.70) for most SF-36 scales; (2) moderate-to-strong correlations between SF-36 scales and disease-specific HRQL instruments (mean r: 0.45 to 0.65) and the Colitis Activity Index, a disease activity measure (mean r: -0.26 to -0.60, with absolute values >0.50 for Bodily pain, Vitality, and Social functioning scales); (3) clinically meaningful differences across UC patients grouped by disease activity status and symptoms (i.e., differences that exceed the established group-level minimal clinically important difference thresholds [ranging 2 – 4 points across scales]); and (4) responsiveness to treatment, indicated by statistically significant treatment-arm differences for most SF-36 scales in randomized-controlled trials. CONCLUSIONS: The SF-36 has strong psychometric properties when used with UC patients. Across studies, SF-36 scales showed robust associations with clinical measures of disease activity. The SF-36 also reflected improvements following treatments that reduced UC activity and severity. Results support the inclusion of the SF-36 as an endpoint in randomized-controlled trials for UC patients to evaluate the effect of treatment on patients’ generic health status.
Conference/Value in Health Info
2016-10, ISPOR Europe 2016, Vienna, Austria
Value in Health, Vol. 19, No. 7 (November 2016)
Code
PGI30
Topic
Patient-Centered Research
Topic Subcategory
Patient-reported Outcomes & Quality of Life Outcomes
Disease
Gastrointestinal Disorders