Fig. 2

Type of diagnosis, (a) pooled population (b) expert versus non-expert centers

^* p ≤ 0.01 for (a) treated population versus untreated population and (b) expert population versus non-expert population. Excluding patients receiving only palliative care. Number of patients with a confirmed diagnosis at expert (691/993, 69.6%) versus non-expert centers (494/790, 62.5%)―p ≤ 0.01. Number of patients with confirmed IPF treated at expert (461/679, 67.9%) versus non-expert centers (235/479, 49.2%)―p ≤ 0.01. For individual questions asked, please refer to Additional files 1 and 2. IPF idiopathic pulmonary fibrosis