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Measuring the Pain Area: An Intra- and Inter-Rater Reliability Study Using Image Analysis Software.

Felipe Jose Jandre Dos Reis1,2, Veronica de Barros E Silva1, Raphaela Nunes de Lucena1

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Pain Practice : the Official Journal of World Institute of Pain
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Summary

Pain drawings are reliable for measuring pain area in clinical research. Different computer screen sizes and mouse use did not affect measurement accuracy, confirming their validity as a tool.

Keywords:
computerized measurementimage softwaremusculoskeletal painpainpain areapain drawingspain measurement

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Area of Science:

  • Medical imaging and biomechanics
  • Clinical research methodology
  • Pain management assessment

Background:

  • Pain drawings are a common tool for clinical information and research.
  • Assessing the reliability of pain drawing measurements is crucial for their validity.
  • Variations in equipment may impact measurement consistency.

Purpose of the Study:

  • To investigate the intra- and inter-rater reliability of area measurements from pain drawings.
  • To assess the impact of different screen sizes and mouse usage on measurement reliability.

Main Methods:

  • Four examiners measured areas on pain drawings from patients with chronic neck pain.
  • Measurements were performed using GIMP and NIH ImageJ software on various computer setups.
  • Intra- and inter-rater reliability was assessed using the intraclass correlation coefficient (ICC).

Main Results:

  • High intra-rater reliability (ICC = 0.989) and inter-rater reliability were observed.
  • No significant differences in measurements were found across different screen sizes or mouse usage.
  • The precision of measurements was deemed acceptable across all tested conditions.

Conclusions:

  • Area measurements from pain drawings demonstrate high reliability.
  • The method is robust and not significantly affected by variations in computer screen size or mouse hardware.
  • Pain drawings are a precise and reliable measurement tool for clinical practice and research.