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Table 2 Comparison of TB incidence rates among patients ever on IPT against those never on IPT (N = 62,983)

From: Effect of isoniazid preventive therapy on tuberculosis incidence and associated risk factors among HIV infected adults in Tanzania: a retrospective cohort study

IPT status

Number of TB cases

Total person-years (TPYrs)

Incidence rate (per 100pyrs)

IRR (95% CI)

Never on IPT

2845

96,845

2.94

1.0

Ever on IPT

279

18,081

1.54

0.52 (0.46–0.59)

Total

3124

114,926

2.7