Notes: Definition of disability differs for each survey. National Health Interview Survey: Unable to carry out major activity; limited in amount or kind of major activity; or limited, but not in major activity. International Center for the Disabled—Louis Harris Survey : Prevented from full participation in work, school, or other activities; having a physical disability, seeing, hearing, or speaking impairment, an emotional or mental disability, or a learning disorder; or considering oneself disabled or considered disabled by others. Survey of Income and Program Participation: For adults, needs assistance with ADLs or IADLS; inability or difficulty in at least one function. For children, having a physical condition that limits the ability to walk, run, or play, or a mental or emotional condition that limits the ability to learn or do school work.
a Ages 16-44.
b Ages 18-49.
c Ages 50-64.
SOURCES: National Center for Health Statistics, 1986; Louis Harris and Associates, Inc., 1986; calculated from Rice and LaPlante, 1988a; U.S. Department of Health and Human Services, 1989d.