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McNemar's Test01:23

McNemar's Test

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McNemar's Test is a nonparametric statistical test used to determine if there is a significant difference in proportions between two related groups when the outcome is binary (e.g., yes/no, success/failure). It is beneficial when we have paired data, such as pre-test/post-test designs, where the same subjects are measured under two different conditions. The test is named after the statistician Quinn McNemar, who introduced it in 1947. It is commonly used in situations where subjects are...
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Related Experiment Video

Updated: Apr 19, 2026

Author Spotlight: Development of a Novel Finite Element Analysis Model for Improved Orthognathic Surgical Techniques
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Author Spotlight: Development of a Novel Finite Element Analysis Model for Improved Orthognathic Surgical Techniques

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Simulation of Tangential Excision: A Test for Construct Validity.

James J Gallagher1, Ian M Goldin, Geoffrey M O'Sullivan

  • 1From the Weill Cornell Medical College, New York.

Journal of Burn Care & Research : Official Publication of the American Burn Association
|December 16, 2014
PubMed
Summary
This summary is machine-generated.

A new simulation model for tangential excision (TE) in burn surgery effectively differentiates surgeon experience levels. This tool shows promise for surgical training, with experts finding it realistic and useful for skill development.

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Area of Science:

  • Surgical Education
  • Burn Surgery Simulation

Background:

  • Tangential excision (TE) is a critical skill in burn surgery.
  • Developing effective training methods for TE is essential for surgical proficiency.

Purpose of the Study:

  • To develop and validate a simulation model for tangential excision (TE).
  • To assess the utility of this simulation in distinguishing between varying levels of surgical experience.

Main Methods:

  • A simulation model was constructed using a TE knife, foam, and other materials.
  • Surgeons with diverse TE experience (novice, intermediate, expert) performed simulated excisions.
  • Performance was evaluated blindly using excisional product analysis and video assessment (OSATS).

Main Results:

  • The simulation successfully differentiated between novice, intermediate, and expert surgeons (P < .0100 to P < .0005).
  • Inter-rater reliability for assessments was acceptable (ICC >= 0.42).
  • Experts reported high agreement (86%) on the simulation's clinical realism and (100%) its training utility.

Conclusions:

  • The developed TE simulation model is effective in assessing surgical skill and experience levels.
  • Simulation-based training holds significant potential for enhancing burn surgery education and performance.