| Covariates | Degree of freedom | Log-rank test | |
| Chi-square | P-value | ||
| Sex | 1 | 0.02 | 0.89 |
| Residence | 7 | 11.71 | 0.11 |
| TB treatment phase | 1 | 28.65 | ≤0.01 |
| TB type | 2 | 0.65 | 0.72 |
| TB category | 3 | 15.17 | 0.02 |
| Previous TB status | 1 | 20.36 | ≤0.01 |
| Baseline smear results | 1 | 0.02 | 0.88 |
| HIV infection | 1 | 0.34 | 0.56 |
| Co-morbidity | 1 | 1.44 | 0.23 |
| Diabetic mellitus | 1 | 0.80 | 0.37 |
| Cancer | 1 | 1.14 | 0.29 |
| Anemia | 1 | 7.07 | 0.01 |