Table 2.

SMS text messaging intervention details of the studies included that performed a trial.

References	Study setting	Reminder type	Frequency of SMS text messaging	Length	Follow-up?	Compensation	Delivery platform	Automated vs Manual	One- vs two-way messaging
Välimäki et al [46], Kannisto et al [45], Kauppi et al [44]a	Inpatient discharge	SMS text messaging	2 to 12 messages per month based on the participant	1 year	No	NRb	Web platform	Semiautomated	One-way
Montes et al [47]	Outpatient/Community	SMS text messaging	Daily	3 months	Yes, 3 months post	NR	Web platform	Automated	One-way
Xu [48]	Rural community	SMS text messaging to the patient/lay health support person	Up to 2 messages per day based on the participant	6 months	No	Points per response in exchange for hygiene items	Web platform	Semiautomated	Two-way
Menon et al [49]	Outpatient	SMS	2 messages per week	3 months	Yes, 3 months post	NR	Cell phone	Manual (study principal investigator)	One-way
Beebe et al [50]	Community	SMS text messaging and a call	Daily	3 months	No	US $10 per monthly assessment	Cell phone	Manual (mental health nurse)	Two-way
Thomas et al [51]	Outpatient	SMS text messaging	5 and 3 days before the appointment	5 days	No	NR	Web platform	Automated	One-way
Pijnenborg [52]	Outpatient	SMS text messaging	1 message per week	7 weeks	No	NR	Web platform	NR	One-way
Kravariti [53]	Community	SMS text messaging	7 days and 1 day before the appointment	6 months	No	Not paid	Web platform	Automated	One-way
Granholm et al [54]	Outpatient	SMS text messaging	12 messages per day	3 months	No	US $35 for in-person assessments, US $20 for text message-based assessments	Web platform	Automated	Two-way
Been-Zeev et al [42], Aschbrenner et al [43]a	Community	SMS text messaging vs calls	Up to 3 messages per day based on the preference	12 weeks	No	Reimbursed up to EUR 30 per month	Cell phone	Manual (social worker)	Two-way

^aIndicates a shared sample.

^bNR: not reported.