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Reference values for pulmonary function tests of Japanese-American men aged 71 to 90 years
D S Sharp1, P L Enright, D Chiu
1National Heart, Lung, and Blood Institute, Bethesda, Maryland, USA.
American Journal of Respiratory and Critical Care Medicine
|February 1, 1996
Summary
Pulmonary function reference equations are crucial for accurate spirometry (lung function tests). New equations derived from elderly Japanese-American men showed existing formulas overpredicted results, highlighting the need for ethnicity- and anthropometry-specific data.
Area of Science:
- Pulmonary Medicine
- Gerontology
- Epidemiology
Background:
- Spirometry is essential for assessing lung function in elderly populations.
- Existing spirometry prediction equations may not accurately reflect diverse ethnic and anthropometric groups.
- The Honolulu Heart Program (HHP) cohort provides a unique dataset of elderly Japanese-American men.
Purpose of the Study:
- To derive new reference equations for spirometry parameters (FEV1, FVC, FEV1/FVC ratio) in elderly Japanese-American men.
- To evaluate the accuracy of existing spirometry prediction equations in this specific cohort.
- To emphasize the importance of using appropriate prediction equations based on ethnicity, age, and height.
Main Methods:
- Spirometry was performed on 3,076 elderly Japanese-American men from the HHP cohort.
- A healthy subgroup (n=528) aged 71-90 years was selected by excluding smokers and individuals with lung disease.
- Reference equations were derived from the healthy subgroup; comparisons were made with existing equations (CHS, younger HHP cohort).
Main Results:
- Existing prediction equations (CHS, younger HHP) consistently overpredicted FVC and FEV1 in the study cohort.
- Overpredictions ranged from 0.15 L to 0.4 L for FVC and FEV1 when using non-specific equations.
- Differences in height (11 cm shorter in HHP vs. CHS) contributed to the discrepancies.
Conclusions:
- Current spirometry prediction equations derived from European-American cohorts or younger populations are inadequate for elderly Japanese-American men.
- New, specific reference equations are necessary for accurate pulmonary function assessment in this demographic.
- Accurate spirometry interpretation requires consideration of ethnicity, age, and height to avoid misdiagnosis.