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National Health and Nutrition Examination Survey 2017-March 2020 Prepandemic Data Files-Development of Files and

Bryan Stierman, Joseph Afful, Margaret D Carroll

    National Health Statistics Reports
    |October 9, 2024
    PubMed

    Insights

    The National Health and Nutrition Examination Survey (NHANES) created prepandemic data files by combining 2017-2018 and partial 2019-2020 data. These files provide nationally representative health estimates from before the COVID-19 pandemic.

    Area of Science:

    • Public Health
    • Epidemiology
    • Biostatistics

    Background:

    • The COVID-19 pandemic disrupted National Health and Nutrition Examination Survey (NHANES) operations in March 2020.
    • Data from the partial 2019-2020 NHANES cycle were not nationally representative due to early termination.
    • Combining 2017-2018 and partial 2019-2020 data created nationally representative prepandemic health estimates.

    Purpose of the Study:

    • To describe the methodology for creating the 2017-March 2020 prepandemic NHANES data files.
    • To provide recommendations and outline limitations for using these prepandemic data.
    • To present prevalence estimates for key health outcomes using the combined dataset.

    Main Methods:

    • Primary sampling units (PSUs) from 2019-2020 were aligned with the 2015-2018 sample design strata.
    • A PSU-level adjustment factor was applied to equalize stratum contributions to the total sample.
    • Participant base weights were adjusted, and final interview and examination weights were calculated.

    Main Results:

    • Prevalence of obesity among children/adolescents (2-19 years) was 19.7%.
    • Prevalence of obesity in adults (20+ years) was 41.9%, with 9.2% having severe obesity.
    • Age-adjusted prevalence of diabetes was 14.8%, hypertension was 45.1%, and complete tooth loss in older adults (65+ years) was 13.8%.

    Conclusions:

    • Weighting adjustments, including a PSU-level factor, enabled the creation of nationally representative 2017-March 2020 NHANES data.
    • This dataset represents the final NHANES data collected prior to widespread COVID-19 transmission.
    • The prepandemic data are crucial for understanding health trends before the pandemic's full impact.
    Abstract

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