TABLE 1—

Reported Reasons for Making the Association Between Vaccination and Autism and Related Disorders

Reported Reason for Making the Association	Percentagea of Respondents Who Mentioned the Reason
Temporal proximity of vaccination and symptomsb	31.5%
Magazine/newspaper	24.2%
Doctor/nurse	21.0%
Web/Internet	19.4%
Family/friends	14.5%
Medical/scientific journals	11.3%
Consumer advocacy group/other parents	11.3%
Previous experience with vaccine adverse event	3.2%
Immunization consent form	3.2%
Comparison with other children	1.6%

^aPercentages sum to greater than 100% because the responses are not mutually exclusive.

^bFor example, “It happened so quickly after the vaccine.”