Expert System for Diagnosing Rheumatoid Arthritis (RA) in the Elderly Using the Certainty Factor Method

M Zaki Putra; Yohanni Syahra

doi:10.59890/ijetr.v4i3.14

Authors

M Zaki Putra Universitas Muhammadiyah Sumatera Utara
Yohanni Syahra Universitas Muhammadiyah Sumatera Utara

DOI:

https://doi.org/10.59890/ijetr.v4i3.14

Keywords:

Expert System, Rheumatoid Arthritis, Elderly, Certainty Factor, ACR/EULAR 2010

Abstract

Elderly-onset rheumatoid arthritis (EORA) is difficult to diagnose at primary healthcare facilities because elderly patients report vague and subjective symptoms and specialists are scarce. This study aims to design and develop a web-based expert system for diagnosing rheumatoid arthritis (RA) in the elderly by translating the ACR/EULAR 2010 classification criteria into IF-THEN rules and applying the Certainty Factor (CF) method, which combines the Measure of Belief and the Measure of Disbelief, as the inference engine. System performance was evaluated with a confusion matrix using 50 historical medical records of elderly patients. The system achieved 92.00% accuracy and 93.33% precision, recall, and F1-score. These results indicate that the approach is reliable as an early screening tool in primary healthcare.

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