Translation, cross-cultural adaptation, validity and reliability of the Brazilian Portuguese version of Activity Scale for Kids questionnaire.

Background: The Activity Scale for Kids (ASK) assesses the physical disability of children (5 to 15 years old) with neurological, orthopaedic or rheumatic diseases. The objective of this study was to translate and cross-culturally adapt the ASK for Brazilian Portuguese and assess the validity and reliability of the instrument.

Methods: A total of 67 children and adolescents with musculoskeletal, neurological or rheumatic diseases participated in the study.