Preliminary Findings for the Development of the Japanese Yale‐Brown Obsessive Compulsive Scale Modified for Olfactory Reference Disorder ( <scp>ORD</scp> ‐ <scp>YBOCS</scp> ‐J)

Abstract The Yale–Brown Obsessive Compulsive Scale Modified for Olfactory Reference Syndrome (ORS‐YBOCS) is a self‐rated measure for assessing the severity of current olfactory reference disorder (ORD) symptoms. This scale has been translated into multiple languages and used in previous studies. However, its psychometric properties have not been investigated. The present study aimed to develop a Japanese ORS‐YBOCS (newly named the ORD‐YBOCS) and conduct a preliminary examination of its reliability and validity. Our study included 104 individuals with self‐reported ORD symptoms. The Japanese ORD‐YBOCS had good internal consistency (α = .81) and partial validity ( r = .43 with Jikoshu‐kyofu symptoms, r = .20 with body image concerns, r = .56 with depression, and r = .27 with fear of negative evaluation). The minimum average partial correlation and the scree plot suggested a one‐factor model, but the confirmatory factor analysis results did not support this. This study is the first to examine the psychometric properties of the self‐reported ORS‐YBOCS. Our results suggest that the Japanese ORD‐YBOCS is a reliable tool to measure ORD symptom severity. Further examination is needed for its validity.