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This study aims to present the cross-cultural adaptation process of the Modified Dyspnea Index to the Brazilian culture and to investigate its content validity and reliability. This process included the steps of translation, back translation and review by two experts to assess semantic, conceptual, idiomatic, cultural and metabolic equivalence. The Index of Content Validity was used to evaluate the extent of inter-observer agreement. A Guide to implement the Modified Dyspnea Index was developeddoi:10.1590/s0104-11692010000500025 pmid:21120424 fatcat:t65kmllckjhenl3pn2vrjtuk7e