Abstract
Variations in lung function between and within individuals result from several factors, many of which may need to be taken into account in the interpretation of clinical data. For many tests, standard equations based on large populations are available, from which an average predicted or reference value can be calculated. The most commonly used incorporate factors for sex, age and body size (usually represented by height); account may, however, also need to be taken of ethnic differences, the posture of the subject or the time of day when the test was performed. For information on the commonly used equations the reader is referred to the detailed account in the classic text by Cotes.1 I have chosen to summarise here some of the more important causes of variations in normal subjects as a background against which changes in disease need to be viewed.
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© 1984 G. J. Gibson
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Gibson, G.J. (1984). Physiological variation. In: Clinical Tests of Respiratory Function. Palgrave, London. https://doi.org/10.1007/978-1-349-81333-9_6
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DOI: https://doi.org/10.1007/978-1-349-81333-9_6
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