Comparison of median IFN-γ responses in all TB suspect children.

Comparison of median IFN-γ in subgroups of children, finding lower median levels in response to specific TB antigens in children <2 years, girls and HIV infected and lower median mitogen responses in children who subsequently died. †Wilcoxon’s rank-sum test used to test differences in median IFN-γ between subgroups of children, p<0.05 considered significant. IQR: interquartile range. *Living PTB+ defined as living in the same household as a person with smear positive pulmonary TB. **Clinically diagnosed with TB and put on anti-TB therapy. ***Subcategory “healthy” used for comparison both for “ill” and “died”.