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==Tags: #autism #study #mmr-vaccine==

Study compared observed rise in reported autism incidences in California verses increase in MMR coverage from 1980-1994. However, the numbers representing the increase in autism cases may not truly represent a rise in cases as the system reporting these numbers was expanding, definitions of autism were changing, etc. See conclusion of the report.  
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Brief Report | March 7, 2001

# **Time Trends in Autism and in MMR Immunization Coverage in California** **FREE**

Loring Dales, MD; Sandra Jo Hammer, RN, PHN; Natalie J. Smith, MD, MPH  
[[](http://jama.jamanetwork.com/article.aspx?articleid=193604#)+] Author Affiliations  
_JAMA._ 2001;285(9):1183-1185. doi:10.1001/jama.285.9.1183.  
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## **Figures****.**

_Figure. Percentage of Children Receiving Measles-Mumps-Rubella (MMR) Immunization in Second Year of Life and Caseload of Children With Autism, by Year of Birth, California, 1980-1994_

The upper 2 curves indicate the percentages of children receiving MMR immunization by 17 and 24 months of age, respectively. The lower curve indicates the number of cases of children with autism[2](http://jama.jamanetwork.com/article.aspx?articleid=193604#REF-JBR00284-2) (and California Department of Development Services, unpublished data, 2000). The vertical dotted line at birth year 1988 is provided as a temporal reference point in comparing the shapes of these curves.

![Image not available.](Exported%20image%2020240808113939-0.png)

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