Table 4. Multivariate logistic regression according to factors for positive QFT results stratified by TST results.
| TST+ | TST− | |||||
| P value | Regression | Odds Ratio | P value | Regression | Odds Ratio | |
| Coefficient | (95% CI) | Coefficient | (95% CI) | |||
| Time of exposure (months) | 0.667 | - | 0.593 | - | ||
| MTC-score | 0.020 | 0.547a | 1.727b | 0.288 | - | |
| (0.234) | (1.091; 2.735) | |||||
| Helminth infection | 0.049 | −2.752 | 0.064 | 0.895 | - | |
| (1.395) | (0.004; 0.983) | |||||
| Ferritin level | 0.143 | - | 0.036 | −0.045a | 0.956b | |
| (0.021) | (0.916; 0.997) | |||||
TST: Tuberculin Skin Test, QFT: QuantiFERON-TB Gold In-Tube, MTC-score: Mycobacterium tuberculosis contact score, BCG: Bacillus Calmette-Guérin.
a
logistic regression coefficient related to quantitative variable.
b
Linear odds ratio; exponential to the regression coefficient.