The findings in the journal Environmental Health Perspectives examine the association between living near commercial pesticide applications and having offspring with autism, but do not show cause-and-effect.

Autism is a neurodevelopmental disorder that ranges in severity and has been on the rise in recent years. Health authorities say it now affects as many as one in 68 children in the United States.

The latest research was based on data about commercial pesticide applications in California, combined with residential addresses of about 1,000 participants in a study of families with an autistic child.