premise: Following the approach of the Section 812 Prospective Report, we estimated the percentage change in the prevalence rate for chronic bronchitis using the estimated coefficient from Schwartz's study in a C-R function, and then applied this percentage change to a baseline incidence rate obtained from another source.
hypothesis: Following the approach of the report, we guessed that the percentage change in the prevalence rate for chronic bronchitis using the coefficient from the study, but found that the result was about 40% too low.