Increase the coverage level of 4 doses of the DTaP vaccine in children by age 2 years — IID‑06 Data Methodology and Measurement

About the National Data


Baseline: 80.7 percent of children born in 2015 received 4 or more doses of DTaP by their 2nd birthday

Target: 90.0 percent

Number of children receiving at least 4 doses of the combination of diphtheria, tetanus, and acellular pertussis antigens by age 2 years (prior to the day of the child's 2nd year birthday).
Number of children born during a calendar year (estimated from NIS-Child data collected during the subsequent 3 years).
Target-setting method
Maintain consistency with national programs, regulations, policies, or laws
Target-setting method justification
The target was selected to align with Vaccines for Children, Section 1928 of the Social Security Act, Section 317 of the Public Health Service Act, Advisory Committee on Immunization Practices (ACIP) Vaccine Recommendations immunization schedule for children, and the Immunization Program Operations Manual. This target helps to ensure effective levels of immunization among children to help control these vaccine-preventable diseases. To be fully effective among young children, four doses of the diphtheria, tetanus, and acellular pertussis (DTaP) vaccine are recommended, with the final dose given during ages 15-18 months.


Methodology notes

The National Immunization Survey-Child (NIS-Child) 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, by age two years, at least 4 doses of the combination diphtheria, tetanus toxoids and acellular pertussis vaccine, the combination diphtheria, tetanus toxoids, and pertussis vaccine (DTP). 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-7.1 in that objective IID-7.1 tracked DTaP vaccinations among children aged 19 to 35 months, while this objective tracks DTaP vaccinations among children by age 2 years and is measured using birth-cohort specific weights.