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St. George's Respiratory Questionnaire: MCID.

Paul W Jones1

  • 1St. George's Hospital Medical School, London, UK. pjones@sghms.ac.uk

COPD
|December 2, 2006
PubMed
Summary
This summary is machine-generated.

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The St. George's Respiratory Questionnaire (SGRQ) minimum clinically important difference (MCID) for COPD is consistently around 4 units. This value, derived from multiple methods, indicates a meaningful improvement in health status for patients with chronic obstructive pulmonary disease.

Area of Science:

  • Pulmonary Medicine
  • Clinical Epidemiology

Background:

  • The St. George's Respiratory Questionnaire (SGRQ) is a key tool for assessing health status in Chronic Obstructive Pulmonary Disease (COPD).
  • Estimating the Minimum Clinically Important Difference (MCID) for the SGRQ is crucial for interpreting trial results and clinical practice.
  • Various methods exist for MCID estimation, including expert opinion, patient preference, and anchor-based approaches.

Purpose of the Study:

  • To evaluate the consistency and reliability of different methods used to estimate the MCID of the SGRQ in COPD patients.
  • To determine a robust and widely applicable MCID value for the SGRQ.

Main Methods:

  • Review and synthesis of existing studies estimating the SGRQ MCID using diverse methodologies.
  • Comparison of MCID values derived from patient preference, expert opinion, anchor-based, and distribution-based methods.

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  • Assessment of the consistency of MCID estimates across different assessment approaches.

    • Main Results:

    • Patient preference, expert, and anchor-based methods consistently yielded an SGRQ MCID of approximately 4 units.
    • Distribution-based methods produced variable MCID estimates, lacking consistency across studies.
    • A 4-unit improvement on the SGRQ has been associated with accepted treatments in clinical practice.

    Conclusions:

    • A consensus MCID for the SGRQ in COPD is around 4 units, supported by multiple estimation methods.
    • Greater weight should be given to the body of evidence rather than single methods due to inherent errors and value judgments.
    • Clinical trial analysis for COPD treatments should utilize statistical tests that compare results against this 4-unit indicative MCID value.