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Number of family members under 18 (fam record)


FAMKIDNO is a 2-digit numeric variable.

03: Top code for 3 or more children (2019-forward)
98: Unknown-not ascertained


For sample adults and sample children, FAMKIDNO reports the number of family members under the age of 18. Prior to 2019, this variable is available for all persons and is collected on the family record. For 2019 forward, FAMKIDNO is collected on the sample adult and sample child questionnaires. If the sample adult and sample child belong to the same family, the family level questions are only asked as part of the first interview and the data are then replicated to the other interview. Starting in 2019, "Unknown-not ascertained" responses are allowed. Prior to 2019, FAMKIDNO is not coded as "unknown" for any persons included in the IPUMS NHIS data.


Prior to 2019, FAMKIDNO is not top-coded. Starting in 2019 FAMKIDNO is top-coded at 3 (3+ children).

The NHIS questionnaire was substantially redesigned in 2019 to introduce a different data collection structure and new content. For more information on changes in terminology, universes, and data collection methods beginning in 2019, please see the user note.


  • 1997-2018: All persons.
  • 2019-2022: Sample adults 18+ and sample children age 0-17.


  • 1997-2022