Chest
Original ResearchCopdDevelopment and Validation of an Improved, COPD-Specific Version of the St. George Respiratory Questionnaire
Section snippets
The SGRQ
A total and three component scores are provided: symptoms (8 items), activity (16 items), and impacts (26 items). The 50 items vary in form between polytomous (eg, Likert-type scale) and dichotomous (eg, “true/false”). In the symptoms component, patients are asked to recall symptoms over a specified time frame: 1 month, 3 months, or 1 year. Other items are not time related. Each item has an empirically derived weight.6 Scores range between 0 (no impairment) and 100 (worst possible health).
Study 1: Development of the Revised Version
Study 1
The PSI of the original SGRQ indicated excellent discriminatory function (PSI, 0.90). One item referring to ability to work was found to have a large number of missing responses (19% compared with a mean of 1% for the other items). It was removed.
Discussion
This analysis of responses to the SGRQ from a large number of COPD patients identified 10 weaker items that could be removed without altering the performance of the instrument. Initial testing found that the SGRQ already had good measurement properties. Its internal reliability has now been improved by removing an item with a low response rate and by using Rasch analysis to identify items that did not fit a unidimensional model so well. The content balance of the SGRQ has been maintained. The
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