Fig. 2a
From: Idiopathic pulmonary fibrosis in the United States: time to diagnosis and treatment
Timing of Oxygen Initiation, Prior to IPF Diagnosis, N = 16,808. (Timing of initiation of supplemental oxygen use before or after the index diagnosis of IPF. A. Relative timing of oxygen initiation in patients that were begun on oxygen therapy prior to the coded index diagnosis of IPF. Shown are the relative percentage of the total patients (N = 16,808) begun on oxygen therapy prior to the diagnosis of IPF, with the time of oxygen use expressed in years before the diagnosis of IPF).