Comparing NIS and MIIC Adolescent Vaccine Coverage Rates - Minnesota Dept. of Health

About Adolescent Immunization Rates from NIS and MIIC

Detailed description of the differences between adolescent immunization rates from the National Immunization Survey (NIS) and the Minnesota Immunization Information Connection (MIIC). Updated 8/18

On this page:
Source
Who is assessed?
How are the rates generated?
Are there differences in how vaccine coverage is defined?
How valid are the rates?
How current are the rates?
Additional resources

Source

National Immunization Survey (NIS) Minnesota Immunization Information Connection (MIIC)
  • Centers for Disease Control and Prevention (CDC).
  • Minnesota Department of Health (MDH).

Who is assessed?

NIS MIIC
  • A random sample of U.S. adolescents ages 13 through 17 years.
  • Sub-analysis available by age, state, some local areas, race/ethnicity, poverty status, and rural versus urban residence.
  • Minnesota adolescents ages 13 through 17 years in the MIIC immunization information system.
  • Sub-analysis available by county and by other variables as requested and as available.

How are the rates generated?

NIS MIIC
  • Minnesota rates are based on a surveyed sample of a few hundred Minnesota adolescents ages 13 through 17 years.
  • The CDC contacts a random sample of families by phone to ask about their adolescents vaccination histories and checks this information against providers' vaccination records.
  • Calculations are based on MIIC records of the approximately 405,000 Minnesota adolescents ages 13 through 17 years in MIIC.

Are there differences in how vaccine coverage is defined?

NIS MIIC
There are differences in how the two data sources define coverage with Tdap, meningococcal, and HPV.
  • Tdap coverage refers to 1 or more doses of the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis vaccine at or after age 10 years.
  • Tdap coverage refers to 1 or more doses of the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis vaccine at any age.
  • Meningococcal coverage refers to 1 or more doses of meningococcal conjugate vaccine or meningococcal vaccine of unknown type.
  • Meningococcal coverage refers to 1 or more doses of quadrivalent meningococcal conjugate vaccine.
  • HPV coverage refers to the percentage of adolescents who have received 1 dose or are up-to-date (UTD). HPV UTD includes those with 3 or more doses and those with 2 doses when the first HPV vaccine dose was initiated prior to age 15 years and there were at least five months minus four days between the first and second doses.
  • HPV coverage refers to the percentage of adolescents who have received 1 dose or are up-to-date (UTD). In 2017, there was a change in methodology for calculating HPV UTD rates. HPV UTD includes those with 3 or more doses and those with 2 or more doses when the first HPV vaccine dose was initiated prior to age 15 years and there were at least five months minus four days between the first and second doses. Before 2017, HPV Series Completion included those who had received 3 or more doses of HPV vaccine and received the first dose at least 6 months before July 1 of the reporting year.

How valid are the rates?

NIS MIIC
  • Minnesota rates are based on a surveyed sample of a few hundred Minnesota adolescents ages 13 through 17 years.
  • Each estimate is accompanied by a "confidence interval," indicating 95 percent likelihood that the true rate falls within this range.
  • Accuracy of the NIS coverage estimates is affected by:
    • Survey design,
    • Statistical adjustments used in calculating rates, and
    • Parental and provider knowledge of adolescent vaccination history.
  • Calculations are based on approximately 405,000 Minnesota adolescents ages 13 through 17 years in MIIC.
  • MIIC data may underestimate the actual percent of adolescents receiving vaccines because:
    • Health care provider participation in MIIC is voluntary,
    • MIIC may include adolescents who have moved and
    • Cross border-state immunization data exchange is limited to Wisconsin and North Dakota.
  • Although approximately 91 percent of Minnesota Vaccines for Children (MnVFC) health care providers routinely submit immunization data to MIIC, not all those who submit data report every administered vaccine or every historical vaccination reported by the patient.
  • When an adolescent moves out of Minnesota, his or her MIIC record may not be updated and the adolescent may still be included in the denominator used to calculate the proportion of adolescents receiving immunization.
  • Finally, data exchange with border state immunization information systems is currently limited to Wisconsin and North Dakota. Vaccinations received in Wisconsin by Minnesota residents are in MIIC, but there is no similar data exchange with South Dakota or Iowa at this time.

How current are the rates?

NIS MIIC
  • NIS surveys are conducted throughout the calendar year, and each year's results are published in the fall of the following year.
  • Rates reflect immunization practices 2 to 4 years in the past.
  • Annual MIIC rates are calculated based on records of adolescents ages 13 through 17 years as of July 1.

Additional resources

  • TeenVaxView
    NIS data for the nation, regions, states, and some local areas from the Centers for Disease Control and Prevention. Attention: Non-MDH link

Updated Tuesday, August 21, 2018 at 05:50PM