Table 7.

Synthesis of the outcomes on antenatal care attendance.

References	Intervention	Impact on antenatal care attendance
Atnafu et al. (39)	SMS reminders	The proportion of mothers receiving more than four ANC visits increased significantly in SMS group compared to baseline. The control group had a non-significant decline in ANC visits.
Hackett et al. (45)	App + SMS reminders	Perinatal home visit was 72% in the intervention group compared to 60% in the control group.
Lund et al. (49)	SMS reminders	Higher odds of receiving four or more ANC visits in the intervention group compared to the control group (44 vs. 31%; OR 2.39).
Modi et al. (19)	App + SMS reminders + data collection module	Significant improvement in coverage home visits in the intervention group during ANC period (adjusted effect size 15.7).
Oyeyemi et al. (56)	Voice calls	ANC utilization was significantly higher in the intervention area compared to the control area (43.4 vs. 36.7%)
Shiferaw et al. (58)	App + SMS reminders + data collection module	Women in the intervention centers significantly more likely to receive at least 4 ANC visits compared to controls (43.1 vs. 28.4%; AOR 1.98)

ANC, antenatal care; AOR, Adjusted Odds Ratio; OR, Odds Ratio; RR, Relative Risk.