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This systematic review examined 14 U.S. studies published since 2000 reporting prevalence estimates for intellectual disability (ID) or developmental disability (DD). Prevalence rates for children were between 11.0 and 13.4 per 1,000 for ID and between 45.8 and 69.9 per 1,000 for DD using data from 2010 or later. A 2015 Ohio study of adults yielded a prevalence estimate of 41.0 per 1,000 for DD. The only study of ID in adults and the only study incorporating DD Act definitions used the 1994/1995 NHIS-D yielding prevalence estimates for ID and/or DD of 38.2 per 1,000 for children birth to 5 years, 31.7 for children 6 to 18 years, and 7.9 per 1,000 for adults. Notable differences in prevalence estimates by age and operational definition have important implications for public policy and research. Serious surveillance gaps limit our understanding of service utilization rates, unmet needs, and health and other outcomes for adults with ID or DD.

Public health and policy planning for adults with intellectual and developmental disabilities (IDD) is imperiled by the lack of ongoing national surveillance data on prevalence and health status. In 2018, the Administration on Intellectual and Developmental Disabilities appointed a workgroup of representatives from key federal agencies and national experts to recommend strategies to improve prevalence estimates and health surveillance for people with IDD. This article presents the workgroup findings on the availability of prevalence and health surveillance data for adults with IDD and suggested items that could identify respondents with IDD on national surveys with special attention to modifications in the National Health Interview Survey. We identify core constructs that must be measured to identify sample members with IDD in population surveys, and additional constructs which, if measured, would support more comprehensive identification of sample members and enhance ongoing surveillance of the health status, outcomes, and unmet needs of this population. We conclude with a brief review of methodological considerations to improve IDD national surveillance including cultural and linguistic sensitivity and the inclusion of U.S. territories in national surveillance protocols.

This article examines everyday choices made by 8,892 adults with intellectual and developmental disabilities (IDD) and support-related choices made by 6,179 adults with IDD receiving services from 19 state developmental disabilities program agencies that participated in the 2008-2009 National Core Indicators Project. Controlling for physical and sensory impairment, age, behavioral support, communication, and state, people in residential settings with 16 or more people had less everyday choice than those in other living arrangements. People with mild and moderate IDD had more control over everyday choices when living in their own homes, whereas people with severe and profound IDD had more control when living in agency homes of 3 or fewer residents. For people of all levels of IDD, institutional settings of 16 or more residents offered the lowest levels of everyday choice. Controlling for the same covariates, individuals with all levels of IDD living in their own homes had significantly more support-related choices than those in any other residential arrangement. Controlling for individual and residential setting characteristics, the state in which sample members lived was notably predictive of support-related choice. Overall, the tested variables accounted for 44% of the variability in everyday choice and 31% in support-related choice.

This study describes service users with Down syndrome (N = 1,199) and a comparative sample with intellectual and developmental disabilities but not Down syndrome (N = 11,182), drawn from National Core Indicator surveys of adult service users in 25 U.S. states. Individuals with Down syndrome were younger than were individuals without Down syndrome. Men with Down syndrome were older than women with Down syndrome, whereas the reverse was true of the individuals without Down syndrome. Most (68%) people with Down syndrome had mild or moderate intellectual disability. The prevalence of vision impairment, hearing impairment, and physical disability increased with age. Adults with Down syndrome were more likely to have Alzheimer's dementia, have a hearing impairment, or be overweight, but they were less likely to have a physical disability than those without Down syndrome. Adults with Down syndrome were less likely to live in institutions or their own home, but they more likely to live in a family member's home. The results of a logistic regression showed that participants were more likely to be reported to be overweight if they had Down syndrome, were female, and were physically inactive, but they were less likely to be reported to be overweight if they were older, had more severe intellectual disability, had cerebral palsy, or were not independently mobile.

This article describes research on the places people with intellectual and developmental disabilities (IDD) live and disparities in housing and long-term services and supports (LTSS) outcomes for people with IDD from racially and culturally minoritized groups. It also summarizes the conclusions and recommendations of the Housing and Long-Term Services and Supports strand of the 2022 State of the Science Conference on the Intersection of Diversity, Equity and Inclusion and Supports and Services for People with IDD, identifies limitations of the available research and recommends strategies to improve research, knowledge translation, and practices., (©AAIDD.)