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Abstract
The 1969 Oregon spirometric predictive equations were evaluated by retesting 199 of
the 988 original sample population after 15 years. The 1969 data were used to test
for sample bias between the retested and not-retested groups. There was no significant
difference in mean values for age, height, or test results except for a five-year
age difference in men. Regression analysis of residuals and the differences between
calculated and predicted values of annual decrements of FVC, FEV1, and FEF25-75% on
age revealed no statistically significant age trend. Although residual means were
statistically significant for FVC and FEV1 for men and FVC and FEF25-75% for women,
the differences between calculated and predicted annual decrements were significant
only for women in FEF25-75%. Although group performance was accurately predicted for
most tests, test SDs and SEMs demonstrated considerable individual variation. Lower
limits of normality are suggested to assist in evaluating previously-tested patients.