GSTM1 and respiratory system disorder: There were no significant differences between the two groups in terms of age, sex, BMI, history of hypertension, hyperlipidemia, diabetes mellitus, stroke, osteoporosis, WBC count, PLT count, Hb content, neutrophil ratio, RBC count, apolipoprotein A, FBG, EOS count, history of smoking, exposure to secondhand smoke, family history of respiratory diseases, cough, sputum, and wheezing (Table 2).