STATISTICAL OBSERVATIONS ON THE REPRODUCIBILITY OF SPIROMETRIC PARAMETERS IN DIFFERENT POPULATION GROUPS

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The reproducibility of ventilatory parameters of routine spirometry was statistically evaluated on three different groups of male adults, composed of 6 well-trained doctors, 30 healthy medical students, and 12 cooperative chest patients.<BR>The normal frequency distribution for VC, FEV1.0, and FEV1.0% was established with 600 spirometric measurements on the 6 doctors, in which these spirometric values were represented as percent deviation of the mean calculated on each subject. The variations of VC, FEV1.0, and FEV 1.0 % were consistently smaller than those of MMF (FEF25-75%) and MVV.<BR>Confidence intervals of 95 % for the mean of VC, FEV1.0, FEV1.0%, MMF, and MVV were presented on each of the groups. Most 95 confidence intervals on the groups of doctors and students seemed to be smaller than those on the group of patients. Statistical analysis of the difference in 95 % confidence interval was described.

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