OBJECTIVE: The aim of this study is a cross-cultural adaptation and validation of the modified fatigue impact scale for Portuguese (MFIS- BR). METHOD: The MFIS was translated to Portuguese and retranslated to English. Two studies pilot had been carried through to be gotten the MFIS-BR, that was applied to 57 consecutive stable MS patients and 45 healthy controls. The retest was applied 30 days later. RESULTS: In the dwarfed statistics the internal consistency reability was similar to the original scale (0.74-0.86). The MFIS-BR showed be able to identify the different groups. Concerning the reliability the interclass correlation coefficient showed an excellent agreement (0.264-1.0). CONCLUSION: The MFIS-BR fills the criteria of applicability, sensibility witch are similar of the original version.
multiple sclerosis; validation study; fatigue diagnosis
