Correspondence between EQ-5D health state classifications and EQ VAS scores.
Health Qual Life Outcomes
; 6: 94, 2008 Nov 07.
Article
en En
| MEDLINE
| ID: mdl-18992139
ABSTRACT
BACKGROUND:
The EQ-5D health-related quality of life instrument comprises a health state classification followed by a health evaluation using a visual analogue scale (VAS). The EQ-5D has been employed frequently in economic evaluations, yet the relationship between the two parts of the instrument remains ill-understood. In this paper, we examine the correspondence between VAS scores and health state classifications for a large sample, and identify variables which contribute to determining the VAS scores independently of the health states as classified.METHODS:
A UK trial of management of low-grade abnormalities detected on screening for cervical pre-cancer (TOMBOLA) provided EQ-5D data for over 3,000 women. Information on distress and multi-dimensional health locus of control had been collected using other instruments. A linear regression model was fitted, with VAS score as the dependent variable. Independent variables comprised EQ-5D health state classifications, distress, locus of control, and socio-demographic characteristics. Equivalent EQ-5D and distress data, collected at twelve months, were available for over 2,000 of the women, enabling us to predict changes in VAS score over time from changes in EQ-5D classification and distress.RESULTS:
In addition to EQ-5D health state classification, VAS score was influenced by the subject's perceived locus of control, and by her age, educational attainment, ethnic origin and smoking behaviour. Although the EQ-5D classification includes a distress dimension, the independent measure of distress was an additional determinant of VAS score. Changes in VAS score over time were explained by changes in both EQ-5D severities and distress. Women allocated to the experimental management arm of the trial reported an increase in VAS score, independently of any changes in health state and distress.CONCLUSION:
In this sample, EQ VAS scores were predictable from the EQ-5D health state classification, although there also existed other group variables which contributed systematically and independently towards determining such scores. These variables comprised psychological disposition, socio-demographic factors such as age and education, clinically-important distress, and the clinical intervention itself. TRIAL REGISTRATION ISRCTN34841617.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Lesiones Precancerosas
/
Psicometría
/
Calidad de Vida
/
Dimensión del Dolor
/
Neoplasias del Cuello Uterino
/
Perfil de Impacto de Enfermedad
Tipo de estudio:
Clinical_trials
/
Etiology_studies
/
Prognostic_studies
/
Risk_factors_studies
/
Screening_studies
Aspecto:
Patient_preference
Límite:
Adult
/
Female
/
Humans
/
Middle aged
País/Región como asunto:
Europa
Idioma:
En
Revista:
Health Qual Life Outcomes
Asunto de la revista:
SAUDE PUBLICA
Año:
2008
Tipo del documento:
Article
País de afiliación:
Reino Unido