Table 2. Retention in care of patients who started antiretroviral therapy between 2007–2010 and 2012–2015 in Zimbabwe.

	Months since ART initiation	2012–2015 Evaluation			2007–2010 Evaluation			Difference
		N	Retention (%)	95% CI	N	Retention (%)	95% CI	%	95%CI	aP value
Overall	6	3476	92.4	(91.5–93.2)
	12	3066	86.5	(85.3–87.5)
	24	1427	79.2	(77.7–80.6)
	36	222	74.4	(72.5–76.1)
Children < 15 years	6	250	97.3	(94.4–98.7)
	12	230	94.2	(90.5–96.4)
	24	114	86.3	(81.0–90.2)
	36	17	82.3	(75.5–87.4)
Adults > 15 years	6	3222	92.0	(91.1–92.9)	3739	90.7	(86.1–93.8)	1.3	(-0.02–2.6)	0.060
	12	2832	85.9	(84.7–87.0)	3641	78.1	(67.7–84.7)	7.8	(5.9–10.0)	<0.001
	24	1311	78.7	(77.1–80.1)	2003	68.8	(58.5–77.5)	9.9	(6.9–12.9)	<0.001
	36	204	73.7	(71.8–75.6)	806	64.4	(55.7–72.3)	9.3	(2.4–16.2)	<0.001

^a: Two-sample test of proportions