Nearly 1% Of U.S. Adults Ages 21 To 40 Have Intellectual Disability

Nearly 1.07% of the U.S. population between ages 21 and 41 has an intellectual disability, representing 818,564 people. The estimate is based on data collected on children ages 3 through 17 years through the National Health Interview Survey waves conducted between 1980 and 1999. No national survey measures the prevalence of intellectual disability among adults.

The prevalence of intellectual disability varied slightly across four age cohorts included in the NHIS waves. Among those born between 1980 and 1984, the prevalence is 1.07%. Among those born between 1985 and 1989, the prevalence is 0.77%. Among those . . .