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Spirometric standards for healthy black adults

J M Stinson, G L McPherson, K Hicks

    Journal of the National Medical Association
    |August 1, 1981
    PubMed
    Summary
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    New spirometry equations for Black adults show lower predicted lung function values than general standards. Race-specific pulmonary function testing is crucial for accurate assessment.

    Area of Science:

    • Pulmonary Medicine
    • Clinical Physiology
    • Respiratory Health

    Background:

    • Standard spirometry reference values may not accurately reflect lung function in diverse populations.
    • Ethnic variations in anthropometry can influence predicted pulmonary function parameters.

    Purpose of the Study:

    • To establish race-specific regression equations for spirometry in Black adults.
    • To compare predicted lung function values with existing general standards.
    • To evaluate the utility of height and sitting height as correction factors.

    Main Methods:

    • Forced expiratory spirometric studies were conducted on 512 healthy, nonsmoking Black adults.
    • Regression analyses were performed using height and age to predict forced vital capacity (FVC), percent vital capacity in 1 second (%FEV1), and forced midexpiratory flow rate (FEF25-75%).

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    Main Results:

    • Predicted FVC, %FEV1, and FEF25-75% were 3.5% to 23% lower than commonly used standards.
    • The FEV1/FVC ratio remained within normal limits across ethnic groups.
    • Sitting height did not significantly differ from half of standing height and was inadequate as a correction factor.

    Conclusions:

    • Race-specific standards are necessary for accurate interpretation of spirometry results in Black adults.
    • Existing general standards may underestimate lung function in this population.
    • Widespread adoption of race-specific pulmonary function testing is recommended.