Table 4.

Hazard ratio of retention in ART care and follow up time in cohort comparing text message reminders to standard of care in three health centers in Mozambique (2011–2013)

	HR* (95%CI)	p
All sites
Intervention arm	0.46 (0.20 – 1.06)	0.068
All sites‡
Intervention and newly initiated on ART**	0.33 (0.12 – 0.91)	0.033
Intervention and at non-newly initiated on ART**	0.54 (0.23 – 1.31)	0.176
Urban‡
Intervention and newly initiated on ART**	0.20 (0.06 – 0.64)	0.006
Intervention and non-newly initiated on ART**	0.34 (0.12 – 0.95)	0.040
Rural‡
Intervention and newly initiated on ART**	7.5 (0.27 – 212.38)	0.237
Intervention and non-newly initiated on ART**	6.2 (0.44 – 87.63)	0.175

95%CI – 95% confidence interval

^*From Proportion Hazard Cox regression fitted respectively for all, urban and rural sites with intervention and interaction of arm and time of follow up.

^**Computed from interaction between intervention arm and indicator less than 3 months on ART; the reference for is respectively control arm and less than 3 months on ART, and control arm and at least 3 months on ART

^‡Non pre-specified analysis – it includes adjustment for time on ART as an indicator for less than 3 months and its interaction with intervention. This way the differential effect due to experience of ART is captured