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Age when fourth HIB shot was received: Time period (no shot record available)

Codes and Frequencies

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For sample persons under age 6 who ever received at least four HIB shots, IMNHIBTP4 reports the time unit (months or years) for the age when the fourth HIB shot was received. IMNHIBTP4 should be used in conjunction with IMNHIBN4, which reports the corresponding number of unit stated by the respondent.

Please use the IPUMS NHIS drop down menu and search functions for related variables.


There are no comparability issues.


  • 1991: Sample persons under age 6 with no available shot record who ever received an immunization and ever received four HIB shots.


  • 1991