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Quality of Life Research
Gepubliceerd in: Quality of Life Research 10/2009

01-12-2009

Same question, different answers: a comparison of global health assessments using visual analogue scales

Auteurs: Mark J. Harrison, Annelies Boonen, Peter Tugwell, Deborah P. M. Symmons

Gepubliceerd in: Quality of Life Research | Uitgave 10/2009

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Abstract

Purpose

To compare responses to two global health VAS of patients with rheumatoid arthritis at the same assessment within the same questionnaire.

Methods

Secondary analysis of randomised controlled trial data. Patients completed the patient global assessment VAS (PG-VAS) (horizontal 10 cm scale, left (0), right (100), no incremental markers) and EQ-5D-VAS (EQ-VAS) (vertical 20 cm scale, 100 at the top, markers at each increment of 10). Both asked “how good or bad is your health today, in your opinion, from 100 ‘Best imaginable health state’ to 0 ‘Worst imaginable health state’.” Agreement was assessed using intra-class correlation co-efficients (ICC) and Bland–Altman plots.

Results

Four hundred and forty-eight patients reported median PG-VAS 66 (IQR 51, 77) and EQ-VAS 65 (IQR 50, 80) scores. Correlation of the VAS scales was moderate at baseline (ICC 0.564) and longitudinally (ICC 0.503). Bland–Altman plots suggested poor concordance of the PG-VAS and EQ-VAS; the limits of agreement were ±32.3 on a 0–100 scale. PG-VAS scores were evenly distributed; EQ-VAS scores clustered at increments of 10; rounding did not improve agreement.

Conclusions

The EQ-VAS and PG-VAS scores are not interchangeable at the individual level. The EQ-VAS correlated more strongly with disease-specific and health-related quality of life measures, therefore, appears preferable.
vorige artikel Patient-reported outcomes instruments: bridging the gap between international copyright laws and common practice for developers and users—a case example
volgende artikel The association of body mass index and health-related quality of life in the general population: data from the 2003 Health Survey of England
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Metagegevens
Titel
Same question, different answers: a comparison of global health assessments using visual analogue scales
Auteurs
Mark J. Harrison
Annelies Boonen
Peter Tugwell
Deborah P. M. Symmons
Publicatiedatum
01-12-2009
Uitgeverij
Springer Netherlands
Gepubliceerd in
Quality of Life Research / Uitgave 10/2009
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-009-9546-3

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Patient-reported outcomes instruments: bridging the gap between international copyright laws and common practice for developers and users—a case example