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How to account for Inuit ancestry in lung function prediction.

Birgitte H Laustsen1,2, Jakob H Bønløkke3, Martin R Miller4

  • 1Department of Clinical Medicine, Danish Ramazzini Centre, Aalborg University, Aalborg, Denmark.

International Journal of Circumpolar Health
|December 6, 2022
PubMed
Summary
This summary is machine-generated.

Accurate lung function prediction equations for the Inuit are needed. Modifying standing height for the Inuit

Keywords:
InuitList ancestryRaceethnicitylung functionlung function prediction equationslung function reference values

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Area of Science:

  • Pulmonary Medicine
  • Anthropometry
  • Public Health

Background:

  • Lung function prediction equations are crucial for diagnosing respiratory diseases.
  • Existing equations, like the Global Lung Function Initiative (GLI) for Europeans, may not accurately represent diverse populations such as the Inuit.
  • There is a lack of specific lung function prediction equations for the Inuit population.

Purpose of the Study:

  • To evaluate the accuracy of Global Lung Function Initiative (GLI) European-based equations for predicting lung function in the Inuit population.
  • To determine if modifying standing height based on known Inuit standing-to-sitting height ratio (SHR) differences improves prediction accuracy.
  • To establish reliable lung function prediction methods for Inuit individuals.

Main Methods:

  • Spirometry data from 351 Inuit and 29 individuals of other ancestry were analyzed.
  • Lung function predictions were initially made using standard GLI equations with recorded standing height.
  • Predictions were re-evaluated using Inuit standing height adjusted for known differences in SHR.

Main Results:

  • Using recorded standing height, Inuit participants showed significantly higher predicted FVC and FEV1 z-scores compared to predicted values.
  • After adjusting height for SHR, Inuit FVC and FEV1 z-scores were no longer significantly different from predicted values.
  • Inuit FEV1/FVC z-scores were not significantly different from non-Inuit, and modification for SHR yielded similar results.

Conclusions:

  • Standard GLI equations with unadjusted standing height overestimate lung function in the Inuit.
  • Adjusting standing height for the known Inuit standing-to-sitting height ratio (SHR) allows for representative lung function predictions using GLI equations.
  • This modified approach provides a more accurate method for assessing Inuit lung function.