Registries:
Immunization Information Systems
States/Cities/Territories
|
 |
| National
Immunization Survey-IIS Study |
Immunization
information systems (IIS) can serve as an important
tool for measuring vaccination coverage levels.
However, the best source of data on vaccinations
among young U.S. children is still the National
Immunization Survey (NIS). The NIS uses
random-digit-dialing to find a sample of households
with children 19-35 months of age. The NIS
draws a separate sample for each calendar quarter
and completes interviews with household respondents
for about 32,000 children each year. With the
consent of parents or guardians, the NIS also
contacts the children’s immunization
providers (by mail) to request a complete vaccination
history from the child’s medical records.
In
order to measure the data completeness of IIS
and better understand how IIS data can add
to the provider data collected from the NIS,
the Centers for Disease Control and Prevention
(CDC) began the NIS-IIS Query Pretest in 2002.
Using IIS in this way may reduce respondent
burden on providers, lower the cost of the
NIS, increase participation in and use of IIS,
and improve the quality of efforts to monitor
vaccination coverage.
To
conduct this pretest, the CDC added a few questions
to the NIS household interview, to obtain permission
to contact state IIS in order to collect immunization
histories. Information received from the state
IIS was compared to immunization data obtained
from immunization providers. Estimates of vaccination
coverage were produced from NIS data and from
IIS data.
The
pretest was conducted in two phases. Phase
1 included one quarter of data from Arizona
(Quarter 3 of 2002), and one quarter of data
from the District of Columbia, Michigan, and
Oklahoma (Quarter 4 2002). Phase 2 began in
2004 and included two quarters of data from
Mississippi, North Dakota, and South Dakota
(Quarters 3 and 4 2004) and one quarter of
data from Wisconsin (Quarter 4 2004). These
IIS were chosen for the pretest because they
have mature databases and over 75% of immunization
providers participating.
Please
click on the links below to see some results
from Phase 1. Phase 2 data collection is on-going
and results will be posted when they become
available.
|
