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Air and helium-oxygen maximum expiratory flow-volume curves were employed in an epidemiologic field study to assess the utility of density dependence as a screening test. Of 1,584 subjects tested, only 54.1 percent were able to perform the test with vital capacities for the two gases that agreed to within 5 percent. Subjects unable to perform the test properly tended to be older, with a greater prevalence of ventilatory function abnormalities and respiratory problems, than those who could perform the test. There was poor concordance between density dependence, or lack thereof, and standard ventilatory function measurements or evidence of respiratory disease. Under field survey conditions, the test of density dependence did not appear to be a useful screening tool.
R J Knudson, and
J W Bloom, and
W T Kaltenborn, and
B Burrows, and
M D Lebowitz
January 1982,
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R J Knudson, and
J W Bloom, and
W T Kaltenborn, and
B Burrows, and
M D Lebowitz
January 1979,
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R J Knudson, and
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W T Kaltenborn, and
B Burrows, and
M D Lebowitz
May 1977,
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R J Knudson, and
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R J Knudson, and
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M D Lebowitz
August 1990,
Chest,
R J Knudson, and
J W Bloom, and
W T Kaltenborn, and
B Burrows, and
M D Lebowitz
January 1981,
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R J Knudson, and
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B Burrows, and
M D Lebowitz
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R J Knudson, and
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B Burrows, and
M D Lebowitz
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R J Knudson, and
J W Bloom, and
W T Kaltenborn, and
B Burrows, and
M D Lebowitz
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R J Knudson, and
J W Bloom, and
W T Kaltenborn, and
B Burrows, and
M D Lebowitz
February 1981,
The American review of respiratory disease,
