Study population (n = 40) characteristics.

Summary of gender, age, body mass index (BMI), smoking history, comorbidities, diagnostic procedures, pulmonary function tests [including vital capacity (VC), total lung capacity (TLC), diffusing capacity of the lung for carbon monoxide (DLCO), and arterial pressure of oxygen (PaO2)], therapy prior and after initial multidetector computed tomography (MDCT), and interval between initial and follow-up MDCT data of the idiopathic pulmonary fibrosis (IPF) patients that constituted the study population. Data are presented as absolute number of patients (n) or median and interquartile range (in brackets).aWas considered the presence or absence of emphysema additionally to fibrosis.bOne value is missing due to patient inability to perform pulmonary function tests.cSeven values are missing due to patient inability to perform the DLCO test.dImmunomodulator indicates azathioprine and\or cyclophosphamide at a dosage clinically indicated.Study population (n = 40) characteristics.