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Technical Notes for NIS-Teen Vaccination Coverage Tables						Print
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			Coverage Estimate MethodologyVaccination Coverage Estimates and 95% Confidence Interval (95% CI)Race/ethnicitySurvey Dates, Interview Dates, and BirthdatesLocal Areas included in the NIS-TeenAbbreviations
		
Coverage Estimate Methodology
The NIS-Teen has a sample size of over 20,000 adolescents with adequate vaccination coverage data reported by provider (adequate provider data). A sample is not the entire population. Sample estimates and population values may be different. The difference is measured through the 95% Confidence Interval (CI). For example, in 2015, the vaccination coverage estimate for 3 or more doses of human papillomavirus vaccine among adolescent girls in the United States was 62.9% +/-1.8%. This means that the true coverage was probably between 61.1% and 64.7%. When comparing two estimates (e.g., between states or between years), an overlap in the confidence intervals indicates that the observed difference might be due to chance.
Vaccination Coverage Estimates and 95% Confidence Interval (95% CI)
The NIS-Teen samples part of the population. It does not collect data for the entire population. The NIS-Teen national sample contains over 20,000 adolescents with adequate vaccination coverage data reported by providers (adequate provider data). Vaccination coverage estimates are based on provider-reported vaccination histories. Complex statistical methods are used to adjust for adolescents whose parents did not participate in the survey, lived in households without telephones, or had vaccination histories that were not reported by their providers.
Vaccination coverage estimates measured by a sample are presented as a point estimate (%) with a 95% CI (+/- a CI half-width). Sample estimates may be different than the true vaccination coverage in a population. Part of the difference may be described by the 95% CI around the estimate. The 95% CI is a measure of precision. Wider confidence intervals are a sign of a relatively small sample size and relatively less precision.
Compared to state or local area estimates, national vaccination coverage estimates are based on a larger sample size, have much smaller CI, and are more precise. For example, in 2016, the vaccination coverage estimate for ≥1 dose of human papillomavirus (HPV) vaccine among adolescents 13-17 years in the United States was 60.4% +/-1.2. (The CI half-width is 1.2.) This means that the true population coverage was probably within the 95% CI of 59.2% (60.4%-1.2) and 61.6% (60.4% + 1.2). The same survey year, the vaccination coverage estimate for ≥1 dose of HPV vaccine among adolescents 13-17 years in Rhode Island was 88.9% +/-3.7. This means that the true population coverage was probably within the 95% CI of 85.2% (88.9%-3.7) and 92.6% (88.9%+3.7). When comparing vaccination coverage rates from NIS-Teen across states, if the confidence intervals do not overlap, then the estimates are statistically different. But if the confidence intervals do overlap, further statistical analysis may be needed to definitively make a determination of statistical difference.
If an estimate is listed as NA (Not Available), the estimate was not reported because it may not be reliable or adequately precise. If the unweighted sample size for the numerator was less than 30 or the [(CI half-width)/Estimate] was greater than 0.6, the estimate may not be reliable or precise. The individuals in that subgroup are still included in the overall sample and the overall coverage estimates. State estimates with a CI half-width greater than 10 percentage points (± 10) may be unreliable, but are reported.
Race/ethnicity
The adolescent’s race was reported by the parent or guardian. Hispanic adolescents can be of any race. Native Hawaiian or other Pacific Islanders and persons of multiple races were not included because of small sample sizes and the estimates may not be reliable or precise.
Survey Dates, Interview Dates, and Birthdates
Survey Dates, Interview Dates, and Birthdates
Adolescents surveyed for the data year...
Were interviewed during...
And born between2022
January 2022 — January 2023
January 2004 — January 20102021
January 2021 — February 2022
January 2003 — February 20092020
January 2020 — January 2021
January 2002 — January 20082019
January 2019 — February 2020
January 2001 — February 20072018
January 2018 — January 2019
January 2000 — January 20062017
January 2017 — January 2018
January 1999 — January 20052016
January 2016 — February 2017
January 1998 — February 20042015
January 2015 — February 2016
January 1997 — February 20032014
January 2014 — February 2015
January 1996 — February 20022013
January 2013 — February 2014
January 1995 — February 20012012
January 2012 — February 2013
January 1994 — February 20002011
January 2011 — February 2012
January 1993 — February 19992010
January 2010 — February 2011
January 1992 — February 19982009
January 2009 — February 2010
January 1991 — February 19972008
January 2008 — February 2009
January 1990 — February 19962007
January 2007 — February 2008
January 1989 — February 19952006
January 2006 — February 2007
January 1988 — February 1994Local Areas included in the NIS-Teen
The NIS-Teen estimates vaccination coverage for the 50 states and selected local areas.

Abbreviations
**HepB: hepatitis B**
**HPV: human papillomavirus**
**MenACWY: quadrivalent meningococcal conjugate**
**MMR: measles-mumps-rubella**
**Td: tetanus-diptheria toxoids**
**Tdap: tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis**
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							Last Reviewed:  August 20, 2020						Source: 	National Center for Immunization and Respiratory Diseases
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