Tables 3 and 4 show the results of the univariate analysis of the association between biological variables (sex, age), sociodemographic factors (place of residence, years of schooling, hospital attended), life habits and clinical variables (history of contact with tuberculosis, body mass index (BMI), use of HAART, time on HAART, presence of AIDS, T-lymphocyte CD4 count) and the two outcomes studied, adherence to TST and TST reactivity. The gene discussed is CD4; the disease is AIDS.