Table 5. Cox Proportional Hazard Models between Attrition and Predictor Variables: 0–12 and 13–24 months on ART.

Variable	0–12 months				13–24 months
	Univariate		Multivariate		Univariate		Multivariate
	HR (95% C.I)	P-value	HR (95% C.I)	P-value	HR (95% C.I)	P-value	HR (95% C.I)	P-value
Age (years)
<15	1		1		1		1
≥15	0.84(0.64–1.12)	0.235	0.85(0.63–1.16)	0.307	0.82 (0.61–1.11)	0.197	0.91 (0.66–1.27)	0.597
Gender
Female	1		1		1		1
Male	1.12 (0.98–1.29)	0.098	1.12(0.97–1.29)	0.122	1.20 (1.03–1.40)	0.017	1.18(1.01–1.37)	0.038
Type of health facility
Secondary	1		1		1		1
Tertiary	0.59 (0.51–0.68)	<0.001	0.61 (0.51–0.73)	<0.001	1.93 (1.66–2.25)	<0.001	2.21 (1.83–2.67)	<0.001
WHO clinical stage
Stage I	1		1		1		1
Stage II	0.87 (0.68–1.11)	0.260	1.02 (0.79–1.32)	0.889	1.50 (1.20–1.87)	<0.001	1.32(1.05–1.66)	0.016
Stage III	1.29 (1.01–1.64)	0.039	1.20(0.93–1.53)	0.159	1.13 (0.90–1.43)	0.285	1.30(1.03–1.66)	0.030
Stage IV	1.65 (1.14–2.39)	0.008	1.53(1.05–2.23)	0.028	1.77 (1.12–2.81)	0.015	1.90(1.20–3.02)	0.007
CD4 count
<200	1		1		1		1
200–350	0.90 (0.76–1.07)	0.235	0.96(0.81–1.15)	0.672	0.95 (0.79–1.13)	0.539	1.01(0.84–1.20)	0.930
>350	0.98 (0.76–1.26)	0.871	1.13(1.03–1.37)	0.384	1.20 (0.94–1.52)	0.148	1.27(0.98–1.65)	0.070
Type of Regimen
AZT based	1		1		1		1
d4T based	1.10 (0.96–1.27)	0.161	1.19(1.03–1.37)	0.019	1.04 (0.89–1.21)	0.630	0.76 (0.63–0.91)	0.002
TDF based	4.72 (2.10–10.64)	<0.001	7.15(2.61–19.57)	<0.001	0.33 (0.10–1.01)	0.053	0.30(0.10–0.93)	0.038