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as a time-varying, rather than stable construct in future empirical and clinical studies. The current study presents a validation of a daily version of the Injustice Experience Questionnaire in chronic low back pain. Results indicate that injustice appraisals vary significantly from day to day, and daily variability in injustice perception shows robust associations with pain intensity, pain-related interference in physical and social activity, and mood in chronic low back pain. These results emphasize the importance of assessing injustice perception as a ti