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Sample quarter, household record

Codes and Frequencies

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QUARTER reports the quarter (of the year) to which the household was assigned for interview. Each quarter of survey data is a nationally representative subsample.

After the 2019 redesign, there is no longer a sampling weight to produce household population estimates. See the user note on the calculation and use of sampling weights for additional information.


This variable is completely comparable prior to 2019.

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.


  • 1963-2018: All households.
  • 2019-2022: Sample adults age 18+ and sample children age 0-17.


  • 1963-2022