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A validated grading scale for crow's feet.

Alastair Carruthers1, Jean Carruthers, Bhushan Hardas

  • 1Department of Dermatology and Skin Sciences, University of British Columbia, Vancouver, British Columbia, Canada. alastair@carruthers.net

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|November 22, 2008
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Summary
This summary is machine-generated.

A new 5-point Crow's Feet Grading Scale objectively quantifies lateral canthal line severity. This reliable photonumeric scale demonstrates high inter- and intra-rater agreement for clinical research and practice.

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Area of Science:

  • Dermatology
  • Aesthetic Medicine
  • Ophthalmology

Background:

  • Lateral canthal lines, commonly known as crow's feet, are a significant concern for patients seeking aesthetic treatments.
  • Objective quantification of crow's feet severity is crucial for clinical research and treatment efficacy assessment.

Purpose of the Study:

  • To develop and validate a reliable photonumeric scale for objective grading of crow's feet severity.
  • To establish the Crow's Feet Grading Scale for use in clinical research and practice.

Main Methods:

  • Development of a 5-point photonumeric rating scale for crow's feet at rest and during orbicularis oculi contraction.
  • Rating of 35 subjects' photographs by nine experts, with comparison to morphed images.
  • Assessment of inter- and intra-rater variability using intraclass correlation coefficients.

Main Results:

  • High inter-expert agreement was observed in the rating of crow's feet severity.
  • High test-retest correlation coefficients indicated low intra-evaluator variability.
  • The scale demonstrated significant reliability for quantifying lateral canthal lines.

Conclusions:

  • The developed 5-point photonumeric scale effectively spans the severity spectrum of crow's feet commonly addressed in aesthetic practice.
  • The Crow's Feet Grading Scale is well-stratified, ensuring consistent and reliable ratings.
  • This validated scale can be utilized for objective assessment in clinical research and practice.