Radiological emphysema associated with IPF had an impact on pulmonary function tests. Despite this difference, the du Bois score was not statistically different between these two groups. Nevertheless, after one year of follow up, the patients with emphysema were in a subclass with a lower mortality rate than those without emphysema.
Bodlet, A., Maury, G., Jamart, J., & Dahlqvist, C. (2013). Influence of radiological emphysema on lung function test in idiopathic pulmonary fibrosis. Respiratory Medicine. https://doi.org/10.1016/j.rmed.2013.08.039