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Background: Pulmonary function tests are used routinely to evaluate patients with respiratory diseases and those who are at risk of developing respiratory diseases. Lung function prediction equations are generally developed for urban populations and whether these differ on rural population is not well studied. There is limited information on prediction equations for rural populations. Objective: The purpose of the present study was to derive prediction equations for commonly used pulmonary function tests in a rural Canadian Caucasian population and to examine whether results of tests were comparable with published equations currently in use. Methods: The Saskatchewan Rural Health Study was a prospective cohort study conducted in 2010-11. Clinical assessments were conducted on 1675 adults and of those, 1609 had satisfactory pulmonary function tests. Ninety two healthy, asymptomatic lifetime nonsmoking rural Caucasian adults were selected to derive rural Canadian predicted equations. The predictive models were compared with three published models (Crapo, Canadian, and Global Lung Function Initiative 2012) for selected tests. In addition to age and height, other factors such as weight and abdominal girth were considered. Results: Comparisons with published references showed good agreement with Canadian equations and present study for males but less agreement for females. Weight or abdominal girth did not improve the predictive model significantly. Conclusion: Although there were slight differences, the prediction equations for rural Caucasians were very much similar to the three published equations, of these two were primarily based on urban subjects (Crapo and Canadian). Therefore, all three published studies can be recommended for the prediction of reference values for rural Canadian Caucasians.

Reference Values of Pulmonary Function Tests for Rural Canadians