Hispanic children often have undiagnosed developmental delays and large numbers of both Hispanic and non-Hispanic children who first were thought to have developmental delay actually had autism, researchers affiliated with the UC Davis MIND Institute have found.
The study, one of the largest to date to compare development in Hispanic and non-Hispanic children, is published in the journal Autism. The results lead the study authors to recommend increased public health efforts to improve awareness, especially among Hispanics, about the indicators of developmental delay and autism.
In conducting the study, the researchers used data from the Childhood Autism Risk from Genetics and the Environment (CHARGE) Study, a population-based study of factors that increase risk for autism or developmental delay. The current study included 1,061 children living in California who were between 24 and 60 months of age. They were divided into three groups: children with autism, children with developmental delay but not autism, and children with typical development. All diagnoses were confirmed or changed based on evaluations by MIND Institute clinicians.
When the outcomes for Hispanic children were compared to non-Hispanic children, the results revealed more similarities than differences in terms of autism profiles, including diagnostic scores, language function, whether or not children lost acquired skills and overall intellectual, social and physical functioning.
A striking outcome, however, was that 6.3 percent of Hispanic children enrolled in the study who were selected randomly out of the general population met criteria for developmental delay, compared with only 2.4 percent of non-Hispanic participants, which is the expected percentage. This raised concerns among the researchers that many Hispanic children with developmental delays may not be getting the services they need.
For both Hispanic and non-Hispanic children, there was a high percentage (about 19 percent overall) of Hispanic and non-Hispanic children recruited for the study with developmental delay who actually met criteria for autism, raising concerns about adequate access to accurate developmental assessment.
The study, titled "Autism spectrum disorders in Hispanics and non-Hispanics," is available at http://aut.sagepub.com/content/16/4/381. The research was funded by the National Institute of Environmental Health Sciences (grants R01-ES015359 and P01-ES11269), the U.S. Environmental Protection Agency's STAR program (grants R-829388 and R-833292) and the UC Davis MIND Institute.