Abstract
The purposes of study were to develop and validate the Japanese version of Pain Anxiety Symptoms Scale-20 (PASS-20). A set of questionnaires including PASS-20, scale of pain severity, the interference sub-scale of Brief Pain Inventory, State-Trait Anxiety Inventory (STAI), Self-rating Depression Scale (SDS), Anxiety Sensitivity Index (ASI) and the item of fear of pain was administered to 449 undergraduates. Confirmatory factor analysis revealed that PASS-20 has four component comprising cognitive anxiety, escape/avoidance, fear, and physiological anxiety. Results of correlation analysis showed that PASS-20 has significant correlations with pain severity and interference. Also, the score of PASS-20 were highly correlated with ASI score, but less so with STAI score. These results indicated that PASS-20 has discriminant validity. It was suggested that PASS-20 has clinical validity because the score of PASS-20 predicted actual fear intensity towards pain. The results of hierarchical regression analysis revealed that total score of PASS-20 was the predictor of pain severity and interference even though STAI and SDS scores were controlled.
