Reduce the proportion of children who get no recommended vaccines by age 2 years — IID‑02 Data Methodology and Measurement

About the National Data


Baseline: 1.3 percent of children born in 2015 had received 0 doses of recommended vaccinations by their 2nd birthday

Target: 1.3 percent

Number of children who had not received any doses of any recommended vaccines by age 2 years (prior to the day of the child's 2nd year birthday), including antigens for diphtheria, tetanus, pertussis, measles, mumps, rubella, Haemophilus influenzae type b, poliovirus, hepatitis A, hepatitis B, varicella, Streptococcus pneumoniae, rotavirus, influenza, or Neisseria meningitidis.
Number of children born during a calendar year (estimated from NIS-Child data collected during the subsequent 3 years).
Target-setting method
Maintain the baseline
Target-setting method justification
Maintain baseline was selected because the data were currently at the desired point. Maintaining the baseline is the desired target because the percent of children who have received no vaccinations by age two years represents the more extreme spectrum of parental vaccine hesitancy, and these children are susceptible to infection with vaccine-preventable diseases. The Healthy People 2030 Workgroup Subject Matter Experts (SMEs) set this target at the baseline since the SMEs had no evidence base to assess how much lower it could go without additional, specific program effort.


Methodology notes

The National Immunization Survey (NIS) uses a quarterly, random-digit-dialed sample of telephone numbers to reach households with children aged 19–35 months in the 50 states and selected local areas and territories, followed by a mail survey sent to the children's vaccination providers to collect vaccination information. Data are weighted to represent the population of children aged 19–35 months (or of children born during a calendar year), with adjustments for households with multiple telephone lines and mixed telephone use (landline and cellular), household nonresponse, and exclusion of households without telephone service. Beginning in 2011, surveys include landline and cellular telephone households. In 2018, surveys only included cellular telephone households. This measure tracks the proportion of children born during a calendar year receiving zero doses of any recommended vaccine by age two years. The Kaplan-Meier method will be used to account for censoring of vaccination status among children whose vaccination history is unknown after age 19-23 months.


Comparable HP2020 objective
Modified, which includes core objectives that are continuing from Healthy People 2020 but underwent a change in measurement.
Changes between HP2020 and HP2030
This objective differs from Healthy People 2020 objective IID-9 in that objective IID-9 tracked children aged 19 to 35 months who had received 9 doses of recommended vaccines, while this objective tracks children who have received 0 doses of recommended vaccines by age 2 years and is measured using birth-cohort specific weights.