CD8A and extrapulmonary tuberculosis: Univariate analysis data demonstrated that there were no significant differences in sex, extrapulmonary tuberculosis, diabetes, drug-resistant tuberculosis, sputum bacterial load before treatment (grade), body mass index, platelet, CD4 and CD8 T lymphocytes between the two groups (P > 0.05), while there were significant differences in age, smoking history, dust exposure history, patient classification, duration of symptoms, leukocyte, hematocrit, erythrocyte sedimentation rate, albumin, globulin and albumin-globulin ratio (P < 0.05) (Tables 2, 3).