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Data
and Statistics > Immunization Coverage in the U.S. > NIS
NIS Data Analysis
Methodologies
The statistical
methodology for estimating vaccination coverage rates for NIS data was
changed in 1998. The new methodology facilitates
valid statistical analyses of NIS data that appropriately accounts for the
survey’s complex sampling design. Small differences exist between
vaccination coverage estimates appearing in MMWRs published before 1998 and
estimates published on this website.
The pre 1998 methodology
is described in Zell, E.R.,
Ezzati-Rice, T.M., Battaglia, M.P., and Wright, R.A. (2000). National
Immunization Survey: The methodology of a vaccination surveillance system.
Public Health Reports, 115(1), 65-77.
The new methodology is
described in Smith, P.J., Rao, J.N.K., Battaglia, M.P., Ezzati-Rice, T.M.,
Daniels, D., Khare, M. (2001).
Compensating for provider nonresponse using response propensities to form
adjustment cells: the National Immunization Survey. National Center for
Health Statistics. Vital Statistics 2(133).
All estimates
published on this website are calculated using this new methodology.
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