. 2018 Apr 19;13(4):e0195127. doi: 10.1371/journal.pone.0195127

Table 2. Summary of incidence rates of attrition by baseline CD4 count strata and time on ART.

Time on ART	0 to 6 months			7 to 12 months			13 to 18 months			19 to 24 months
Baseline CD4 strata	PY^*	No. LTFU	LTFU/100 PY^**	PY	No. LTFU	LTFU/100 PY^*	PY	No. LTFU	LTFU/100 PY^*	PY	No. LTFU	LTFU/100 PY^*
0–200 cells/μl	283	108	38.2 (95%CI:31.1–46.1)	194	33	17,1	86	13	15,1	36	5	13,8
0–200 cells/μl	283	108	38.2 (95%CI:31.1–46.1)	194	33	(95%CI:12.1–23.9)	86	13	(95%CI:8.8–26.0)	36	5	(95%CI:5.7–33.1)
201–350 cells/μl	323	119	36,9	223	52	23,3	109	11	10,1	50	8	16,0
201–350 cells/μl	323	119	(95%CI:30.1–44.0)	223	52	(95%CI:17.8–30.6)	109	11	(95%CI:5.6–18.3)	50	8	(95%CI:8.0–32.2)
351–500 cells/μl	263	96	36,50	184	22	11,9	87	9	10,3	38	2	5,30
351–500 cells/μl	263	96	(95%CI: 29.9–44.6)	184	22	(95%CI:7.9–18.2)	87	9	(95%CI:5.4–19.8)	38	2	(95%CI:1.3–21.0)
>500 cells/μl	223	95	42,7	156	36	23,1	80	19	23,8	28	3	10,6
>500 cells/μl	223	95	(95%CI:34.9–52.2)	156	36	(95%CI:16.7–32.0)	80	19	(95%CI:15.2–37.3)	28	3	(95%CI:3.4–33.0)
Total	1092	418	38,30	756	143	18,9	362	52	14,4	152	18	11,8
Total	1092	418	(95%CI:34.8–42.1)	756	143	(95%CI:16.1–22.3)	362	52	(95%CI:10.9–18.9)	152	18	(95%CI:7.5–18.8)

*PY: Person Years

**Incidence rates were calculated using the stptime command in Stata 13^TM