More than one in 50 American children have been diagnosed with a disorder on the autism spectrum, according to a new paper published in JAMA on Tuesday, in a finding that suggests diagnoses of the condition have leveled off. The new research also shows that the disorder continues to be more frequently diagnosed in white children than among non-white children.

About 2.7 percent of non-Hispanic, white children have been diagnosed with autism, Asperger’s syndrome or another developmental disorder on the spectrum. Only 1.8 percent of Hispanic children and 2.3 percent of black children have autism spectrum disorder diagnoses; the national rate is 2.4 percent. The researchers used data from the National Health Interview Survey for their analysis; all other racial or ethnic groups were included in a fourth category.

The rate of autism spectrum diagnoses among all children did increase a bit each year between 2014 and 2016; however, these increases were not considered statistically significant. This is the first time in more than a decade that the rate has plateaued.

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