Table 4: The production of IFN-γ in response to M.tb specific antigens.

GroupsIFN-γ (IU/mL)
Responders/group (%) RangeMean ± SD*P value**

TB 38/43 (88%)0–12.1 <0.001
NMLD 32/46 (69%)0–13.9 0.4
Household TB contacts24/41 (58%)0–12.0 0.29
Work TB contacts41/48 (85%)0–12.7 <0.001
Controls 20/46 (43%)0–12.0

Mean ± SD values of cytokine in whole bood cultures stimulated with M.tb antigens (TB Ag-Nil); significance value between the responses in controls and each group of participants.