Characteristics of the Washington Group Short Set in Assessing Functional Difficulty Among People With Physical Disability Certificates of Vision, Hearing, and Lower-Limb Impairments in Japan

PDC holders with mild impairment were less likely to be captured by the WG-SS as "having disability" than those with severe impairment. These findings suggested a characteristic of the WG-SS that the disability statistics based on the WG-SS may underrepresent PDC holders with mild impairment. Stakeholders in Japan need to take into account this characteristic when they use or interpret the WG-SS.