DEFINITIONS AND FINDINGS ON INTELLECTUAL

Abstract

This article describes the use of the National Health Interview Survey-Disability Supplement (NHIS-D) to estimate the prevalence and general characteristics of persons with intellectual and/or developmental disabilities in the non-institutionalized U.S. population. It provides estimates of the populations of non-institutionalized persons with intellectual disability (defined categorically), with developmental disabilities (defined functionally) and with both. It describes how the prevalence of intellectual and/or developmental disabilities varies by age, poverty status and other demographic variables. It describes how intellectual disabilities and developmental disabilities are operationally different, and how the people identified in those groups differ substantially both in number and in demographic characteristics. An analysis of poverty status among adults reveals that poverty is significantly more common for women, people who were not white, people with intellectual or developmental disabilities, adults with less than 12 years of education, and people living with a spouse or alone (as compared to people living with relatives such as parents or siblings).