Table 2.

Data extraction categories for eligible studies

Category	Data extracted
Study characteristics	First author, year, country, study design
Participant	Eligibility criteria (including different levels in recruitment/sampling plan), demographics, data collection setting
Intervention characteristics	Content, delivery method, unit of delivery, deliverer, setting, exposure quantity and duration, time span, effect size of intervention
Assignment method	Unit of assignment Method used to assign units to study conditions, including details of any restriction Inclusion of aspects employed to help minimize potential bias comparison condition induced due to non-randomization
Participant flow	Flow of participants: enrollment, assignment, allocation and intervention exposure, baseline and outcome measures, follow-up
Recruitment	Method of recruitment, sampling method, recruitment setting
Retention	Method to increase compliance or adherence