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Effect of spirometer temperature on FEV1 in a longitudinal epidemiological study
F D Gilliland1, W Linn, E Rappaport
1University of Southern California, School of Medicine, Department of Preventive Medicine, Los Angeles 90033, USA. gillilan@hsc.usc.edu
Occupational and Environmental Medicine
|February 5, 2000
Summary
Spirometer temperature variations can introduce errors in pulmonary function tests like FEV1. Standard corrections are insufficient, necessitating additional temperature adjustments for accurate epidemiological study results.
Area of Science:
- Pulmonary Physiology
- Epidemiological Research Methods
- Biomedical Instrumentation
Background:
- Pulmonary function measurements are crucial for epidemiological studies.
- Spirometer temperature fluctuations can affect measurement accuracy.
- Standard Body Temperature, Pressure, and Saturation (BTPS) corrections may not fully account for temperature variations.
Purpose of the Study:
- To quantify the error in forced expiratory volume in 1 second (FEV1) measurements due to spirometer temperature variations under field conditions.
- To evaluate the effectiveness of standard BTPS corrections in mitigating temperature-induced errors in spirometry.
- To determine if additional temperature correction is needed for accurate epidemiological data.
Main Methods:
- Analysis of 995 test-retest spirometry pairs from 851 school children.
- Utilized linear regression to assess the relationship between spirometer temperature differences and FEV1 measurements.
- Investigated temperature differences ranging from -13°C to +9°C over 1-110 day intervals.
Main Results:
- A significant dependence of BTPS-corrected FEV1 on spirometer temperature differences was observed (p < 0.05).
- FEV1 measurements showed a -0.24% change per degree Celsius change in spirometer temperature, after accounting for growth and circadian effects.
- Standard BTPS correction was found to be insufficient when spirometer temperatures varied widely.
Conclusions:
- Standard BTPS correction does not fully compensate for gas volume changes caused by wide spirometer temperature fluctuations.
- Additional correction for spirometer temperature variation is recommended to enhance the accuracy of pulmonary volume measurements in epidemiological research.
- Improved accuracy in spirometry is vital for reliable large-scale health studies.