In order to increase statistical power, continuous variables were redefined as dichotomous variables using the following arbitrary cut-off values: age 31 years (median of study population), BMI 18.5 kg/m2 (World Health Organisation definition of malnutrition in adults), CD4+ count 200 cells/μl (AIDS defining), TB treatment period of 2 weeks. This evidence concerns the gene CD4 and tuberculosis.