ArticleQuality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation2015
The St George's Respiratory Questionnaire revisited: a psychometric evaluation.
Article in Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
- Assessing the impact of a respiratory care bundle on health status and quality of life of chronic obstructive pulmonary disease patients in Jordan: A quasi-experimental study.Journal of education and health promotion · 2024Article
- Impact of telephone follow-up on COPD outcomes in pulmonary rehabilitation patients: A randomized clinical trial.Canadian journal of respiratory therapy : CJRT = Revue canadienne de la therapie respiratoire : RCTR · 2023Article
- Validation of the Connor-Davidson Resilience Scale-10 in South Africa: Item Response Theory and Classical Test Theory.Psychology research and behavior management · 2022Article
- Validation of the fear of COVID-19 scale in South Africa: Three complementary analyses.Annales medico-psychologiques · 2021Article
- A Psychometric Analysis of the Structured Clinical Interview for theAssessment · 2021Article
- A multi-center psychometric evaluation of the Severity Indices of Personality Problems 118 (SIPP-118): Do we really need all those facets?Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2021Article
- Self-management and health related quality of life in persons with chronic obstructive pulmonary disease.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2019Article
- Evaluation of the Fecal Incontinence Quality of Life Scale (FIQL) using item response theory reveals limitations and suggests revisions.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2018Article
- The COPD-SIB: a newly developed disease-specific item bank to measure health-related quality of life in patients with chronic obstructive pulmonary disease.Health and quality of life outcomes · 2016Article
- Using the Three-Step Test Interview to understand how patients perceive the St. George's Respiratory Questionnaire for COPD patients (SGRQ-C).Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2016Article
- Article
- Establishing a common metric for self-reported pain: linking BPI Pain Interference and SF-36 Bodily Pain Subscale scores to the PROMIS Pain Interference metric.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2015Article
- Identifying key domains of health-related quality of life for patients with chronic obstructive pulmonary disease: interviews with healthcare professionals.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2015Article
- Introduction to special section: quantitative methods.Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation · 2015Article
- Identifying key domains of health-related quality of life for patients with chronic obstructive pulmonary disease: the patient perspective.Health and quality of life outcomes · 2014Article
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Authors and funding
7 authors.
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Abstract
purposeThe 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.
methodsThe 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.
resultsThe 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.
conclusionThe 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.
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