Decline of FEV1The one second forced expiratory volume, the FEV1, remains one of the most useful tests of lung function in epidemiological studies.Despite the introduction of more subtle and more specific tests, none has sup- planted it as a means of detecting and quantifying environmental effects on respiratory health.Recently convincing evidence has appeared' that the FEV, not
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P. D. Oldham (1987) studied this question.
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