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The variability of the parameters derived from analysis of the forced vital capacity and the expired nitrogen trace after a vital capacity inhalation of oxygen (closing volume) within a day, from day to day, and from week to week, has been determined. Effort-dependent tests as vital capacity and peak expiratory flow showed the least variability. The greatest variability was seen in effort-independent tests of function such as the maximal expiratory flow rate at 25 per cent (75 per cent of expired vital capacity) and 50 per cent of vital capacity, as well as closing volume. The degree of variability in the tests used was uninfluenced by the periodicity of the tests or the age or smoking habits of the subjects tested. It is suggested that variability of tests of respiratory function should be taken into account in their interpretation.
D S McCarthy, and
D B Craig, and
R M Cherniack
January 1973,
Scandinavian journal of respiratory diseases,
D S McCarthy, and
D B Craig, and
R M Cherniack
September 1974,
The American review of respiratory disease,
D S McCarthy, and
D B Craig, and
R M Cherniack
April 1977,
Thorax,
D S McCarthy, and
D B Craig, and
R M Cherniack
April 1979,
Nihon Kyobu Shikkan Gakkai zasshi,
D S McCarthy, and
D B Craig, and
R M Cherniack
January 1988,
Respiration; international review of thoracic diseases,
D S McCarthy, and
D B Craig, and
R M Cherniack
January 1972,
Plucne bolesti i tuberkuloza,
D S McCarthy, and
D B Craig, and
R M Cherniack
June 1986,
Chest,
D S McCarthy, and
D B Craig, and
R M Cherniack
May 1982,
Chest,
D S McCarthy, and
D B Craig, and
R M Cherniack
May 1976,
The American review of respiratory disease,
D S McCarthy, and
D B Craig, and
R M Cherniack
December 1980,
The American review of respiratory disease,
