Table 3. Risk factors for attrition in three different programs and sites in the Democratic Republic of Congo.

Riskfactor		Participants N(%)	Unadjusted HR (95% CI)	Adjusted HR (95% CI)	P-value
Study site, n (%)	HEAL Africa	314 (60.5)	1	1	<0.001
	Amo-Congo	147 (27.9)	2.29 (1.54–3.42)	2.15 (1.35–3.40)
	Monkole	61 (11.6)	5.14 (3.32–7.94)	4.77 (2.90–7.85)
Initial age of Child (years), n (%)	>2 years	334(66.2)	1	1	<0.001
	≤2 years	170(33.8)	2.41(1.71–3.40)	2.16 (1.48–3.16)
Initial CD4 cell count of child (cells/µL), n (%)	≥350-more	121 (23.4)	1	1	0.039
	>200–<350	83 (15.9)	3.12 (1.55–6.27)	2.87 (1.36–6.07)
	>0–200	193 (37.2)	3.29 (1.77–6.11)	2.70 (1.40–5.21)
	Missing	122 (23.5)	3.80 (1.98–7.29)	2.24 (1.11–4.51)
Education of child, n (%)	Primary or less	138 (27.6)	1	/	/
	Secondary school	149 (29.7)	2.74 (1.56–4.82)
	Not yet eligible	214 (42.7)	2.90 (1.70–4.95)
Religion of caregiver, n (%)	Catholic	166 (33.4)	1	1	0.003
	Protestant	144 (29.0)	0.78 (0.44–1.36)	1.90 (0.51–1.59)
	Independant/other	187 (37.6)	2.07 (1.34–3.21)	1.86 (1.19–2.90)

HR: Hazard Ratio; CI: Confidence Interval;

P-value from Cox-regression model adjusted for all factors in final model, including site as a fixed effect.