To test the psychometric properties and criterion validity of the Japanese version of the EVortReward Imbalance (ERI) Questionnaire (Siegrist, 1996), a survey was conducted among 105 male dental technicians. The Japanese version of the questionnaire was developed through a backtranslation process. Internal consistency and factorial structure were tested and the criterion validity with respect to musculoskeletal symptoms was estimated with the help of a correlation matrix and logistic regression analysis. In psychometric terms, the factorial structure of the scales measuring the components of the theoretical concept was replicated satisfactorily, and internal consistencies of the scales measuring the extrinsic and intrinsic components of the model were appropriate. Signi® cant associations between components of the ERI and musculoskeletal symptoms were found. Logistic regression analysis revealed a signi® cantly elevated risk of musculoskeletal symptoms in participants scoring high on the scale measuring the model's intrinsic component,`overcommitment'. This study indicates that, at least for the occupational group under study, the Japanese version of the ERI Questionnaire is a feasible and psychometrically well justi® ed new measure for assessing psychosocial stress at work with relevance to health.

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