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Related Experiment Videos

Consultation, waiting, prescribing and referral patterns: some methodological considerations

J L Campbell1, R A Elton

  • 1University of Edinburgh, Department of General Practice, UK.

Family Practice
|June 1, 1994
PubMed
Summary

Determining adequate sample sizes is crucial for reliable medical practice research. This study establishes minimum sample sizes for valid conclusions on doctor consultation times, waiting times, and prescribing/referral patterns in UK general practice.

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Area of Science:

  • Medical Statistics
  • General Practice Research
  • Healthcare Quality Improvement

Background:

  • Accurate measurement of clinical practice patterns is essential for quality improvement.
  • Previous studies may lack sufficient sample sizes for drawing definitive conclusions.
  • Understanding necessary sample sizes enhances the validity of research findings in general practice.

Purpose of the Study:

  • To determine the minimum sample sizes required for statistically valid conclusions on average waiting times, consultation times, and prescribing/referral patterns in UK general practice.
  • To provide evidence-based guidance on sample size adequacy for future research in primary care.

Main Methods:

  • Utilized statistical techniques including plotting cumulative means against sample size.

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  • Employed a formula based on maximum available sample size and mean/standard error to calculate 'stabilization values'.
  • Analyzed data from 136 general practitioners encompassing 40,363 consultations.

    • Main Results:

    • Determined stabilization values: 120 for consultation time, 200 for mean waiting time, 170 for prescribing patterns, and 490 for referral patterns.
    • These values represent minimum sample sizes for statistically valid conclusions with a predetermined degree of certainty.
    • Findings highlight the need for substantial sample sizes in general practice research.

    Conclusions:

    • Confident conclusions regarding average waiting and consultation times, and prescribing and referral patterns require specific minimum sample sizes.
    • Studies examining these measures must utilize sample sizes at least as large as those determined in this research.
    • The findings offer critical insights for designing future studies in UK general practice to ensure robust and reliable results.