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Related Experiment Videos

Time domain spirogram indices. Their variability and reference values in nonsmokers.

M R Miller, D M Grove, A C Pincock

    The American Review of Respiratory Disease
    |November 1, 1985
    PubMed
    Summary
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    This study establishes reference values for lung function using time domain spirogram indices in healthy adults. New indices may better detect subtle lung function abnormalities.

    Area of Science:

    • Pulmonary Medicine
    • Respiratory Physiology
    • Biostatistics

    Background:

    • Dynamic ventilatory lung function assessment is crucial for diagnosing respiratory diseases.
    • Conventional spirometric indices have limitations in detecting certain lung function abnormalities.
    • Establishing robust reference values for lung function tests is essential for accurate clinical interpretation.

    Purpose of the Study:

    • To determine variability and establish reference values for time domain spirogram indices.
    • To compare the influence of data selection methods on prediction equations.
    • To identify novel time domain indices superior to conventional ones for abnormality detection.

    Main Methods:

    • Cross-sectional population survey of 226 healthy non-smokers (83 men, 143 women).

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  • Analysis of dynamic ventilatory lung function using time domain spirogram indices.
  • Development of prediction equations and reference values based on regression analysis.

    • Main Results:

    • Prediction equations for FEV1 and FEF25-75% were minimally affected by data selection methods.
    • Spirogram variability increased with age, necessitating log transformation for analysis.
    • Proposed reference values derived from predicted values and residual standard deviation.

    Conclusions:

    • New time domain indices show promise for identifying abnormalities in the latter part of the spirogram.
    • The study provides valuable reference data for lung function assessment.
    • Age-related variability in lung function requires careful consideration in analysis.