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Quality of Life Research
Gepubliceerd in: Quality of Life Research 1/2015

01-01-2015 | Quantitative Methods Special Section

The St George’s Respiratory Questionnaire revisited: a psychometric evaluation

Auteurs: Muirne C. S. Paap, Danny Brouwer, Cees A. W. Glas, Evelyn M. Monninkhof, Benjamin Forstreuter, Marcel E. Pieterse, Job van der Palen

Gepubliceerd in: Quality of Life Research | Uitgave 1/2015

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Abstract

Purpose

The St George’s Respiratory Questionnaire (SGRQ) has clearly acquired the status of legacy questionnaire for measuring health-related quality of life in patients with chronic obstructive pulmonary disease (COPD). The main aim of this study was to assess the underlying dimensionality of the SGRQ and to investigate the added value of the empirical weights used to calculate total scores.

Methods

The official Dutch translation of the SGRQ was completed by 444 COPD patients participating in two clinical studies. These data were used for secondary data analysis in this study. Three complementary statistical methods were used to assess dimensionality: Mokken scale analysis (MSA), parametric multidimensional item response theory (IRT) and bifactor analysis. Additionally, the original SGRQ weighting procedure was compared to IRT-based weighting.

Results

The results of the MSA and multidimensional item response theory (MIRT) pointed toward a unidimensional structure. The bifactor analyses indicated that there was a strong general factor, but the group factors did have additional value. Nineteen items performed poorly in the MSA, MIRT analysis or both. Shortening the scale from 50 to 31 items did not negatively impact measurement precision. SGRQ total score and IRT-derived scores correlated strongly, 0.90 for the one-parameter model and 0.99 for the two-parameter model.

Conclusion

The SGRQ contains some multidimensionality, but an abbreviated version can be used as a unidimensional tool in patients with COPD. Subscale scores should be used with care. SGRQ total scores correlated highly with IRT-based scores, and thus, the weighting methods may be used interchangeably to calculate total scores.
vorige artikel Predictors of perceived asthma control among patients managed in primary care clinics
volgende artikel Energy, fatigue, or both? A bifactor modeling approach to the conceptualization and measurement of vitality
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Voetnoten
1
Total scale: nine items showed poor fit under the 1PL model, five under the 2PL model. Shorter scale: 3 items showed poor fit under the 1PL model, 0 under the 2PL model.
 
2
To obtain the discrimination parameter per category, the parameter estimate was multiplied by category number for polytomous items. This value was then used in calculating the correlations.
 
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Metagegevens
Titel
The St George’s Respiratory Questionnaire revisited: a psychometric evaluation
Auteurs
Muirne C. S. Paap
Danny Brouwer
Cees A. W. Glas
Evelyn M. Monninkhof
Benjamin Forstreuter
Marcel E. Pieterse
Job van der Palen
Publicatiedatum
01-01-2015
Uitgeverij
Springer International Publishing
Gepubliceerd in
Quality of Life Research / Uitgave 1/2015
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI
https://doi.org/10.1007/s11136-013-0570-y

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