F2 and lung disorder: The 25 variables are as follows: age, gender, prior lung disease, coronary heart disease, smoking, lobe, mediastinal lymph node enlargement or calcification, height, weight, FVC/ pred FVC, FEV1/predFEV1, FEV1/FVC, DLCO.SB, white blood cell, absolute neutrophil count, red blood cell, hemoglobin, prothrombin time, activated partial thromboplastin time, thrombin time, D. dimer, albumin, creatinine, fissure, and neutrophilic granulocyte percent.