Backward stepwise multivariate logistic regressions for predicting QuantiFERON-TB Gold in Tube (QFT-GIT) or QuantiFERON-TB Plus (QFT-Plus) positivity
| QFT-GIT positive | QFT-Plus positive | |||
| OR (95% CI) | p-value | OR (95% CI) | p-value | |
| Time spent with the index case h per day | ||||
| 1–12 | 1 | 1 | ||
| >12 | 4.63 (2.05–10.47) | 0.0002 | 6.98 (2.86–17.02) | 1.98×10−5 |