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The purpose of this study was to measure the reliability, internal consistency, construct validity, and floor and ceiling effects of the Brazilian version of the Self-Estimated Functional Inability Because of Pain Questionnaire for athletes (SEFIP-sport). This was a validity questionnaire study developed in a university community. Athletes or practitioners of any sport undertaking regular practice (weekly frequency of at least twice a week for at least 6 months), with the ability to read and write in Brazilian Portuguese, were included. W