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Background:  Behcet's Disease (BD) is a vasculitis of unknown origin. It is mainly seen around the Silk Road. The classification tree is the most sensitive and accurate criteria for the classification and diagnosis of the disease. The use of a classification tree necessitates having the diagram in hand. An arithmetic method was developed to replace the diagram by easy‐to‐remember figures.

Methods:  Each criterion was given an appropriate value: ocular lesions were given 5 points, oral aphthosis 4 points, genital aphthosis 3 points, pathergy phenomenon 2 points, and skin manifestations 1 point. Seven points or higher values were necessary to classify a patient as having Behcet's disease. The arithmetic method was tested in 5276 BD patients and in 2407 control patients.

Results:  The sensitivity of the classification tree was 97.2%, the specificity was 96.7%, and the accuracy was 97.1%. The arithmetic method …