Results of multiple logistical regression: odds ratio for a positive early secretory antigenic target 6 result in a comparison between the groups of close and occasional contacts
| Risk factor | Odds ratio | 95% CI | p-value |
| Stratification (close versus occasional contacts) | 29.2 | 3.5–245.0 | 0.002 |
| Age yrs | 1.1 | 0.99–1.2 | 0.6# |
| Origin (East/West Germany) | 2.2 | 0.56–8.5 | 0.3# |
| BCG vaccination | 0.31 | 0.05–1.9 | 0.2# |
CI: confidence interval; BCG: bacille Calmette–Guérin. #: nonsignificant.