Document Detail

Using HAQ-DI to estimate HUI-3 and EQ-5D utility values for patients with rheumatoid arthritis in Spain.
MedLine Citation:
PMID:  21211502     Owner:  NLM     Status:  In-Data-Review    
BACKGROUND/OBJECTIVE: Utility values are not usually assessed in clinical trials and do not allow cost-utility analysis to be performed with the data collected. The aim of this study was to derive relation functions so that Health Assessment Questionnaire - Disability Index (HAQ-DI) scores could be used to estimate Health Utilities Index - 3 (HUI-3) and EQ-5D utility values for patients with rheumatoid arthritis (RA).
METHODS: An observational, cross-sectional, naturalistic, multicentre study was conducted. A total of 244 patients aged 18 years or older, with RA according to American College of Rheumatology diagnostic criteria, were recruited. Sociodemographic and clinical variables were recorded and patients completed three generic HRQoL questionnaires: the HAQ-DI, the HUI-3, and the EQ-5D. Two linear regression models were used to predict HUI-3 and EQ-5D utility values as functions of HAQ-DI scores, age, and gender.
RESULTS: Patient mean age was 57.8 years old (standard deviation [SD], 13.3 years); 75.8% of the patients were women and 95.9% were white. Mean disease duration was 10.8 years (SD, 9 years). Patient distribution according to HAQ-DI severity was as follows: HAQ-DI < 0.5, 29%; 0.5 ≤ HAQ-DI < 1.1, 28%; 1.1 ≤ HAQ-DI < 1.6, 16%,1.6 ≤ HAQ-DI < 2.1, 15%; and HAQ-DI ≥ 2.1, 12%. HAQ-DI and EQ-5D mean scores were 1.02 (SD, 0.78) and 63.1 (SD, 20.3), respectively. Mean utility values for HUI-3 and time trade-off (TTO) were 0.75 (SD, 0.21) and 0.65 (SD, 0.3), respectively. The equations converting HAQ-DI scores to utilities were HUI-3 = 0.9527 - (0.2018 × HAQ-DI) +ε (R(2)=0.56), and TTO = 0.9567 - (0.309 × HAQ-DI) + ε (R(2)=0.54). Error distribution was non-normal. Age and gender were found to have no bearing on the utility functions.
CONCLUSIONS: HAQ-DI scores can be used to estimate HUI-3 and EQ-5D utility values for patients with RA in data obtained from studies where utility values have not been collected.
Agata Carreño; Ignacio Fernández; Xavier Badia; Cristina Varela; Montserrat Roset
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Value in health : the journal of the International Society for Pharmacoeconomics and Outcomes Research     Volume:  14     ISSN:  1524-4733     ISO Abbreviation:  Value Health     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100883818     Medline TA:  Value Health     Country:  United States    
Other Details:
Languages:  eng     Pagination:  192-200     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 International Society for Pharmacoeconomics and Outcomes Research (ISPOR). Published by Elsevier Inc. All rights reserved.
Health Economics and Outcomes Research - IMS Health, Barcelona, Spain.
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