Mean IL-12 levels in supernatants of r32-kDa Ag-stimulated PBMCs from 65 TB patients in different clinical categories and from healthy controls. Dots represent levels in pg/ml. Diamonds with vertical bars represent mean ± SD of results for each category. Results are shown for the following groups (with the number of patients in the group in parentheses): PTB-0 (24) and EPTB-0 (9), PTB-2/4 (7) and EPTB-2/4 (3), PTB-6 (6) and EPTB-6 (5), and healthy controls (11). P values were <0.000 for control group results versus PTB-0, EPTB-0, and PTB-2/4 group results; <0.028 for control group results versus EPTB-2/4 group results; <0.001 for control group results versus PTB-6 group results; and <0.017 for control group results versus EPTB-6 group results.