Nearly 1 in 10 American children have been diagnosed with some form of developmental disability, according to the CDC.

The agency’s National Center for Health Statistics found that 8.5% of children between ages 3 and 17 have been diagnosed with a developmental or intellectual disability – and that number shoots up to greater than 10% among boys.

Researchers say the increase is mostly due to a larger number fo diagnoses for ADHD and autism.