Skin test results at different times of BCG immunisation and varying times between tuberculin skin testing and immunisation for different antigens
| BCG (+) > 10mm/total (%) | BCG (–) > 10mm/total (%) | RR | 95% CI | p value | |
|---|---|---|---|---|---|
| 5TU PPD | |||||
| BCG at infancy (n=10) | 2161/9712 (22.3%) | 1730/9004 (19.2%) | 1.16 | 1.09 to 1.23 | <0.0001 |
| Skin test <15 years since BCG | 736/5828 (12.6%) | 111/2138 (5.2%) | 2.4 | 2.00 to 2.97 | <0.0001 |
| Skin test >15 years since BCG | 1343/2843 (47.2%) | 1538/3748 (41.0%) | 1.2 | 1.09 to 1.22 | <0.0001 |
| BCG given after infancy (n=4) | 1028/2890 (35.6%) | 902/5192 (17.4%) | 2.08 | 1.89 to 2.21 | <0.0001 |
| Skin test <15 years since BCG | 41/141 (29.1%) | 11/378 (2.9%) | 10 | 5.29 to 18.89 | <0.0001 |
| Skin test >15 years since BCG | 918/2443 (37.6%) | 810/1696 (47.8%) | 0.8 | 0.74 to 0.85 | <0.0001 |
| 2TU RT23 | |||||
| BCG at infancy (n=1) | 807/2435 (33.1%) | 74/861 (8.6%) | 3.86 | 3.07 to 4.87 | <0.0001 |