“Disability and Health in the United States, 2001–2005 examines health-related differences between disabled and nondisabled noninstitutionalized adults aged 18 years and over using data from the National Health Interview Survey (NHIS). The basic actions difficulty measure of disability used in this report identifies noninstitutionalized adults with respondent-reported difficulties in movement or sensory, emotional, or cognitive functioning that is associated with some health problem. The complex activity limitation measure of disability identifies noninstitutionalized adults with respondent-reported limitations in self-care tasks (activities of daily living (ADL) or instrumental activities of daily living (IADL)) work limitations, or limitations or restrictions in the ability to participate fully in social activities.”