From: The effect of isoniazid preventive therapy on incidence of tuberculosis among HIV-infected clients under pre-ART care, Jimma, Ethiopia: a retrospective cohort study
Group
No. of cases of tuberculosis
No. of PY
Incidence rate of TB per 100 PY (95% CI per 100 PY)
IPT
13
586.16
2.22 (1.29- 3.82)
non-IPT
36
711.41
5.06 (3.65 - 7.02)
Overall TB incidence
49
1297.50
3.8 (2.85 - 4.99)