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Age (in months) of first polio vaccine from record and verbal history

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For sample children under 6 years old who reported any information regarding their polio vaccine(s) and who received at least one polio vaccine, IMAPOLAGE1 reports the person's age when he or she received the first polio vaccine.

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There are no comparability issue with this variable.


  • 1991: Sample persons under age 6 who reported any information on polio vaccines and received one or more polio vaccines.


  • 1991