Measuring disability in an urban slum community in India using the Washington Group questionnaire.

Background: The UN recommends that the 'Washington Group questionnaire (WGQ) on functioning' is used for data collection on disability. There are few studies on the WGQ from India.

Objective: To evaluate the prevalence of disability in a community-health project, using this tool: to examine if the use of the WGQ identifies more people with disability than the tools used previously.