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This is a 4-digit numeric variable with 3 implied decimal places. That is, a value of 0123 should be interpreted as 0.123 The command files delivered with IPUMS extracts automatically divide BMICALC by 1,000, so no further adjustment is needed.


For sample adults and sample children, CPI2009 provides the Consumer Price Index multiplier (available from the Bureau of Labor Statistics) to convert dollar figures to constant 2009 dollars. Multiplying dollar amounts by this variable (which is constant within years) will render them comparable across time and thus suitable for multivariate analysis. Prior to 2019, CPI2009 is available for all persons.

For IPUMS NHIS, 2009 dollars represent data in 2010 as income is asked about for the previous year.

For more information on how to use CPI2009, please see the IPUMS NHIS User Notes on Consumer Price Index.


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


  • 1963-2022