Variable CHR [95% CI] AHR [95% CI]
HAART status Pre HAART 1 1
On HAART 0.561 [0.324, 0.972]* 0.032 [0.012, 0.082]**
CD4 cell count (in cells/µl) <200 1 1
  201-349 0.29 [0.15, 0.57]** 0.044 [0.016, 0.120]**
≥ 350 0.62 [0.34, 1.15] 0.053 [0.018, 0.149]**
WHO clinical stage Stage I or II 1 1
Stage III or IV 2.64 [1.51, 4.63]** 6.290 [3.345, 11.828]**
**Significant at p value <0.01, *Significant at <0.05
Table 3: Factors associated with time to incidence TB at the bivariate and multivariate cox regression.