Baseline characteristics of subjects
| Variables | Active TB | Low risk for TB |
| Subjects n | 87 | 131 |
| Age yrs | 48.0±16.4 | 15.7±0.5# |
| M:F ratio | 58:29 | 131:0# |
| BCG vaccination | 45 (51.7) | 131 (100.0)# |
| TST size mm | 12.5±10.0 | 4.0±5.4# |
Data are presented as mean±sd or n (%), unless otherwise stated. TB: tuberculosis; M: male; F: female; BCG: bacille Calmette–Guérin; TST: tuberculin skin test. #: p<0.05 compared with active TB.