TABLE 2.

Intervention Characteristics of Targeted Client Communication

Deployment Characteristic	Definition
Modality	To which communication channel (voice, SMS/text, social media platform) were messages sent?
Directionality	Were messages one-way or two-way; provider to client and/or client to provider?
Tailoring	Were messages sent with information specific to the client, such as messages that include the client's name, the nearest or most appropriate clinic to receive services, or address a particular set of risk factors.
Phrasing	Were messages sent to inform or to motivate a client?
Schedule	When and how frequently were messages sent? For example, SMS reminders sent at 10am, 3 days and 1 day before child's vaccination date.