Agreement of the 12-item World Health Organization Disability Assessment Schedule (WHODAS) 2.0 in parents and youth with physical illness living in Canada.

Youth and their parents interpret the construct of disability, as measured by the 12-item WHODAS 2.0, similarly. Thus, informant differences represent real differences that are not a consequence of error. Low parent-youth agreement reinforces the need for collecting multiple perspectives in the pediatric setting, especially for male youth.Implications for rehabilitationThe WHODAS 2.0 is one of the most widely used measures of disability and functioning.Measurement invariance of the WHODAS 2.0 suggests that youth and parents interpret the construct of disability similarly.Parent-youth agreement was low and youth typically report more disability compared to parent proxies.More consistent agreement with parents was found for female youth compared to male youth.