ALB and chronic obstructive pulmonary disease: The most important predictive factors for COPD diagnosis were lung function tests (ie, FEV1/FVC, percent vital capacity [%VC], and %FEV1) and smoking status, followed by cough, hematological indices (ie, MCV, MCHC, MCH, Hb, and HT), treatment with antidiabetic drugs, hemoglobin A1c, serum albumin, total protein, and BMI.