Reliability and validity of the Korean version of the Functional Status Score for the ICU after translation and cross-cultural adaptation.

The Korean version of the FSS-ICU showed excellent intra-rater and inter-rater reliability, internal consistency, and construct validity for medical ICU patients. The results of this study, along with prior publications, support that the FSS-ICU Korean version is a valid and reliable assessment tool for the ICU environment.Implications for rehabilitationIntensive care unit patients usually experience decreased muscle strength and physical function.The Korean version of the Functional Status Score for the Intensive Care Unit (FSS-ICU) is suitable for use with Korean speakers and has a valid, reliable measurement tool for physical function of intensive care unit patients.A well-standardized training with videos and written materials is important to ensure correct implementation of the Korean version of the FSS-ICU.