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How to evaluate measuring methods in the case of non-defined external validity

A Rückmann¹, B Ehle, H J Trampisch

¹Department of Medical Computer Science and Biomathematics, Ruhr-University Bochum, Germany.

The Journal of Rheumatology

|October 1, 1995

Summary

Evaluating new rheumatoid arthritis assessments requires an alternative approach due to the lack of established criteria. Measurement error can assess repeatability and rater agreement for grading systems, aiding clinical routine disease progress evaluation.

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Area of Science:

Rheumatology
Radiology
Clinical Assessment

Background:

Clinical assessment of chronic diseases typically compares new measurements against established criteria to evaluate disease progression.
Rheumatoid arthritis lacks established criteria, posing challenges for evaluating radiological assessment grading systems.

Purpose of the Study:

To propose an alternative approach for evaluating rheumatoid arthritis grading systems.
To investigate the use of measurement error as a metric for repeatability and rater agreement in rheumatoid arthritis assessment.

Main Methods:

The study focuses on utilizing measurement error as a key indicator.
This approach involves comparing measurement error to the progress of the grading score.

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Main Results:

Measurement error can serve as a viable measure for assessing repeatability in radiological assessments.
It also provides a method for evaluating rater agreement in the context of rheumatoid arthritis progression.

Conclusions:

Measurement error offers a practical solution for evaluating grading systems when established criteria are absent.
This method supports reliable assessment of disease progress in rheumatoid arthritis clinical routines.