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Related Experiment Video

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Development of a Virtual Reality Assessment of Everyday Living Skills
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Measuring Competency: Improving the validity of your procedural performance assessments.

Pamela B Andreatta1, Christopher H Renninger1, Mark W Bowyer1

  • 1From the Department of Surgery, Uniformed Services University of the Health Science and the Walter Reed National Military Medical Center, Bethesda, MD.

Annals of Surgery Open : Perspectives of Surgical History, Education, and Clinical Approaches
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Summary

Interval scales offer a more precise measurement of surgical competency compared to ordinal scales. This enhanced assessment identifies specific capability gaps, improving surgeon training and performance in complex trauma procedures.

Keywords:
competency-based assessmentinterval scalesordinal scalesperformance-based assessmentsurgical competencesurgical performance assessment

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Area of Science:

  • Surgical Education
  • Trauma Surgery Assessment
  • Medical Measurement Scales

Background:

  • Surgical performance assessment often relies on nonparametric data, limiting inferential statistical analysis.
  • Parametric analyses, supported by interval scales, are crucial for accurately determining surgical competency.
  • This study investigates the efficacy of ordinal versus interval scales in evaluating surgeons performing complex trauma procedures.

Purpose of the Study:

  • To compare the effectiveness of ordinal and interval scales in capturing surgical competency data.
  • To determine which scale type provides more accurate and actionable insights into surgeon performance.
  • To evaluate the impact of scale choice on identifying specific performance gaps in trauma surgery.

Main Methods:

  • Board-certified or eligible general surgeons performed three complex trauma procedures on cadavers.
  • Assessments were conducted by rigorously certified experienced trauma surgeons.
  • Descriptive statistics were used to compare outcomes between interval (parametric) and ordinal (nonparametric) scales.

Main Results:

  • Ordinal scales overestimated surgical competence in up to 100% of participants.
  • Ordinal scales failed to identify specific performance or capability gaps.
  • Interval scales provided greater granularity and pinpointed specific areas for improvement.

Conclusions:

  • Imprecise measurement tools like ordinal scales can create a false sense of competence.
  • Interval scales offer a more precise method for measuring surgical competency by assessing discrete procedural components.
  • Accurate measurement is essential for surgeons to identify and address capability gaps effectively.