Table 3.

Risk differences and risk ratios of retention in antiretroviral care comparing text message intervention to standard of care in three health facilities in Mozambique, 2011–2013

			Rate Differences		Rate Ratios
	Control	Intervention	PE (95%CI)	p	PE (95%CI)	p
Retention at 12 months %, (95% CI)*
All sites	91.0 (87.7 – 93.4)	93.8 (90.9 – 95.7)	2.8 (−0.9 – 6.4)	0.1393	–
Urban	89.9 (86.1 – 93.1)	94.3 (91.3 – 96.4)	4.4 (0.4 – 8.5)	0.0320	–
Rural	96.8 (87.9 – 99.2)	90.7 (80.4 – 95.7)	−6.1 (−14.5 – 2.2)	0.1482	–
Attrition incidence per 100 person-years within first 12 months of follow up, PE (95% CI)
All sites	9.5 (6.8 – 13.1)	6.4 (4.3 – 9.5)	−3.0 (−7.0 – 1.0)	0.1389	0.68 (0.41 – 1.13)	0.1386
Urban	10.7 (7.6 – 15.0)	5.8 (3.7 – 9.1)	−4.9 (−9.3 – −0.4)	0.0306	0.54 (0.31 – 0.95)	0.0324
Rural	3.2 (0.8 – 12.9)	10.0 (4.5 – 22.2)	6.8 (−2.4 – 15.9)	0.1661	3.10 (0.63 – 15.34)	0.1662

PE = point estimate;

95%CI = 95% confidence interval

^*Kaplan-Meier based estimates at end of 12 months of follow up and differences of retentions tested using z-test