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Updated: Jun 13, 2026

Phenotyping Mouse Pulmonary Function In Vivo with the Lung Diffusing Capacity
Published on: January 6, 2015
Year-to-year changes in lung function in individuals with cystic fibrosis
Theodore G Liou1, Eric P Elkin, David J Pasta
1University of Utah, 26 North 1900 East, Salt Lake City, UT 84132-4701,USA. ted.liou@utah.edu
Background:
We examined the year-to-year change in FEV(1) for individuals and the overall cystic fibrosis population to better understand how individual trends may differ from population trends.
Methods:
We calculated individual yearly changes using the largest annual FEV(1) percent predicted (FEV(1)%) measurement in 20,644 patients (6-45years old) included in the Epidemiologic Study of Cystic Fibrosis. We calculated yearly population changes using age-specific medians.
Results:
FEV(1)% predicted decreased 1-3 points per year for individuals, with maximal decreases in 14-15year olds. Population changes agreed with individual changes up to age 15; however after age 30, yearly population change approximated zero while individual FEV(1)% predicted decreases were 1-2 points per year.
Conclusions:
Adolescents have the greatest FEV(1)% predicted decreases; however, loss of FEV(1) is a persistent risk in 6-45year old CF patients. Recognizing individual year-to-year changes may improve patient-specific care and may suggest new methods for measuring program quality.
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