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Figure 1. Prevalence of autism in children aged 2 to 12 years by year of birth from 1989 to 2003. Prevalence is estimated by dividing the number of active status children with autism recorded by the California Department of Developmental Services in June of each year from 1995 to 2006 by the number of live births in California from 1989 to 2003.26 AAP-USPHS indicates American Academy of Pediatrics and the US Public Health Service; Hib, Haemophilus influenzae type b; and PRP-T, polyribosylribitol phosphate conjugated to tetanus toxoid.
