Table 1. Clinical and demographic features of study subjects. Data are presented as n, mean ± SD or n(%), unless otherwise stated. Abbreviations: IP = interstitial pneumonia; FVC = forced vital capacity; MRC = medical research council dyspnea scale; IPF = idiopathic pulmonary fibrosis; CHP = chronic hypersensitivity pneumonitis; NSIP = non-specific interstitial pneumonia UIP = usual interstitial pneumonia. *, diagnosed by multi-disciplinary discussion diagnosis