Odds ratio for a positive tuberculin skin test result with a cut-off of 5 mm
| Risk factor | Odds ratio | 95% CI | p-value |
| Stratification (close versus occasional contacts) | 19.7 | 2.0–190.2 | 0.01 |
| Age yrs | 0.98 | 0.95–1.0 | 0.9# |
| Origin (East/West Germany) | 1.8 | 0.64–5.3 | 0.3# |
| BCG vaccination | 4.8 | 1.3–18.0 | 0.02 |
CI: confidence interval; BCG: bacille Calmette–Guérin. #: nonsignificant.