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National Immunization Survey (NIS) - Adults only

U.S. Vaccination Coverage Reported via NIS

The NIS-Adult study is designed to help researchers better understand why some adults choose not to get vaccinated for preventable diseases.

NIS-Adult was a landline telephone survey conducted during May, June, July and August 2007. The sample was selected at random from two national lists of household telephone numbers. (One list was age-group and racial/ethnic group-specific of respondents to the National Health Interview Survey. The other list was provided by a subcontractor, Survey Sampling International and was age-group-specific.) Vaccinations were self-reported and not validated by comparing to the respondent’s medical chart. The interview completion rate was 74% with a 64% resolution rate and a 64% screening rate for a CASRO rate of 31%. (“CASRO” stands for Council of American Survey Research Organizations, which defined a standardized overall response rate for telephone surveys that is the product of three specific rates—interview completion rate, resolution rate, and screening rate.) Before analysis the data were weighted to adjust for non-response, households that do not have a landline telephone or do not have a telephone, and to match the age, gender and racial/ethnic distribution of the country. The contracting survey company was the National Opinion Research Center (NORC) at the University of Chicago.

For more information about the NIS-Adult, please view the Frequently Asked Questions by respondents.

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