Kaplan RM, Tally S, Hays RD, Feeny D, Ganiats TG, Palta M, Fryback DG. Five preference-based indexes in cataract and heart failure patients were not equally responsive to change.
J Clin Epidemiol 2010;
64:497-506. [PMID:
20685077 DOI:
10.1016/j.jclinepi.2010.04.010]
[Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2009] [Revised: 04/12/2010] [Accepted: 04/22/2010] [Indexed: 10/19/2022]
Abstract
OBJECTIVE
To compare the responsiveness to clinical change of five widely used preference-based health-related quality-of-life indexes in two longitudinal cohorts.
STUDY DESIGN AND SETTING
Five generic instruments were simultaneously administered to 376 adults undergoing cataract surgery and 160 adults in heart failure management programs. Patients were assessed at baseline and reevaluated after 1 and 6 months. The measures were the Short Form (SF)-6D (based on responses scored from SF-36v2), Self-Administered Quality of Well-being Scale (QWB-SA), the EuroQol-5D developed by the EuroQol Group, the Health Utilities Indexes Mark 2 (HUI2) and Mark 3 (HUI3). Cataract patients completed the National Eye Institute Visual Functioning Questionnaire-25, and heart failure patients completed the Minnesota Living with Heart Failure Questionnaire. Responsiveness was estimated by the standardized response mean.
RESULTS
For cataract patients, mean changes between baseline and 1-month follow-up for the generic indices ranged from 0.00 (SF-6D) to 0.052 (HUI3) and were statistically significant for all indexes except the SF-6D. For heart failure patients, only the SF-6D showed significant change from baseline to 1 month, whereas only the QWB-SA change was significant between 1 and 6 months.
CONCLUSIONS
Preference-based methods for measuring health outcomes are not equally responsive to change.
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