Figure 4.

Estimated Cox survival curves adjusted for confounding factors in patients with histopathologic usual interstitial pneumonia with and without bronchiolocentric fibrosis in the (A) total cohort (n=252) and (B) the cohort with idiopathic pulmonary fibrosis (IPF) (n=215). Adjusted confounding factors are age, male, ever-smoking, IPF diagnosis, gastroesophageal reflux disease (GERD), baseline forced vital capacity percent predicted value (%FVC), and baseline diffusion capacity of carbon monoxide percent predicted value (%DLCO) for the total cohort, and age, male, ever-smoking, GERD, %FVC, and %DLCO for the IPF cohort.