Chest
Fifteen-year Interval Spirometric Evaluation of the Oregon Predictive Equations
Section snippets
Material and Methods
A total of 208 men and women from the original sample population were still residing in the Willamette River Valley of western Oregon and were available for retesting. No information was available concerning the whereabouts of the subjects who had relocated or died. Questionnaires similar to those in the original study were used to assess intercurrent cardiopulmonary diseases, cigarette smoking, and exposure to ambient and occupational air pollutants since 1969. Interviewers reviewed the
Results
We reexamined the 1969 test values for 961 men and women after 27 deletions for erroneous value. The revised data were then fitted by age and height to multiple regression equations for men and women. Original and revised equations are listed in Table 4. Coefficients of multiple correlation and standard errors of estimate for the original and revised equations are listed in Table 5. The revised equations are similar to the original equations; therefore, the revised equations were used in the
Discussion
A major problem in any longterm study is the loss of subjects due to geographic relocation, illness, death, or failure to cooperate. The exact status of all our subjects not retested is uncertain, but the majority moved out of the region. The survival effect of selective mortality over an extended period of time could result in a sample with relatively better ventilatory function15 and possibly lower cross-sectionally predicted spirometric values compared with observed values.5 Theoretically,
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Partially funded by NIH Biomedical Support Grant RR-07079.
Manuscript received March 20; revision accepted May 26.
Reprint requests: Dr. Morris, VA Medical Center, PO Box 1034, Portland, Oregon 97207