Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.
Number of children aged 19 to 35 months receiving at least 3 doses of the polio antigen
Number of children aged 19 to 35 months
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 were weighted to represent the population of children aged 19–35 months, 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 included landline and cellular telephone households.
This measure tracks the proportion of children aged 19 to 35 months receiving at least 3 doses of the poliovirus vaccine.
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