Table 2. Total, new and recurrent tuberculosis (TB) incidence rates according to duration of antiretroviral therapy.

ART Duration(month)	Total TB episodes	PY at risk	Rate (per 100 PY) [95% CI]	Newa TB episodes	PY at risk	Rate (per 100 PY) [95% CI]	Recurrent TBb episodes	PY at risk	Rate (per 100 PY) [95% CI]	% recurrent TB [95% CI]
0–12	174	1400	12.43 [10.82–14.35]	46	438	10.49 [7.88–14.26]	128	962	13.31 [11.33–15.74]	73.6 [66.4–79.9]
12–24	84	1252	6.71 [5.48–8.30]	29	375	7.74 [5.44–11.38]	55	878	6.27 [4.88–15.74]	65.5 [54.3–75.5]
24–36	70	1138	6.15 [4.90–7.82]	15	323	4.65 [2.86–8.08]	55	816	6.75 [5.23–8.86]	78.6 [67.1–87.5]
36–48	68	1023	6.64 [5.30–8.44]	15	282	5.32 [3.25–9.29]	53	741	7.15 [5.55–9.38]	77.9 [66.2–87.1]
48–60	49	899	5.45 [4.18–7.25]	7	242	2.89 [1.41–6.90]	42	657	6.39 [4.81–8.70]	85.7 [72.8–94.1]
>60	39	793	4.92 [3.64–8.62]	9	202	4.45 [2.37–9.33]	30	591	5.08 [3.59–7.42]	76.9 [60.7–88.9]
Overall	484	6506	7.44 [6.82–8.13]	121	1862	6.50 [5.41–7.84]	363	4644	7.81 [7.06–8.68]	75.0 [70.9–78.8]

ART, antiretroviral therapy; TB, tuberculosis; PY, person-years; CI, confidence intervals.

^ano previous episodes of TB, a time-updated variable.

^bany previous episodes of TB, including prior to ART enrolment, a time-updated variable.