Table 1.

Duration and frequency of interventions

First author	Mode of administration	Intervention duration and frequency
Gordon [20]	Video on a DVD	One-off view of 12-min video prior to virtual consultation
Kerfoot [19]	e-mail or mobile app	2 “game” questions, twice a week for 6 months to be answered individually and with the option of answering as part of an assigned team
Whittemore [29]	In-person group sessions and SMS system	After 7 weekly in-person group sessions, 6 months of daily text messages
Gunawardena [27]	Mobile app	Daily or weekly reminders described as user-defined for 6 months
Kusnanto [26]	Mobile app	Daily notification messages (6/day) for 3 months
Lee [22]	Mobile app	Feedback in the form of short supportive messages via app from health care professions 1–2/week for 6 months
Hilmarsdottir [25]	Smartphone app	Brief weekly messages for 4 months (number not reported) along with individualized encouragement messages through the app from the first author Further 2 months of both types of messages every other week
Capozza [18]	SMS system	1–7 messages daily for 6 months described as user-defined contact because the message “STOP” could be used any time to reduce number of messages
Xu [21]	SMS/ phone system with automated contact and bidirectional communication	Average 3 messages weekly with option for bidirectional communication with healthcare provider for 6 months, occurrence was tailored to individual in the event of an abnormal reading or trend being logged
Poppe [23]	website and app	Daily and weekly messages in the form of messages or education sessions were made available for 5 weeks