Table 2.

Potential subgroups for which outcomes are recorded

General subgroups	Specific subgroups
Stakeholders	Demand-side stakeholders: orthodontic patients and their family members
	Supply-side stakeholders: clinicians, office staff, clinic owners, researchers, guideline developers, policy makers, implant companies, etc.
	Users/non users: both demand- and supply-side stakeholders can be further subdivided in those that have used OMIs previously (users) and those that do not use these devices (non-users)
Interventions	Specified interventions: these interventions refer to a specific phase or type of the interventional procedure. Phases of the intervention refer to the: anesthetics, implant insertion, orthodontic treatment with OMIs, implant removal, or the healing phase. Types of interventions refer to the implant type and dimensions, number of implants, use of plates, the surgical procedure, implant location, timing and forces of orthodontic loading, etc. [41].
	‘Non specified’ interventions: these interventions refer to ‘any orthodontic treatment with OMIs’. Additional information on the specific phase or type of the interventional procedure is not provided
Time points	Pre-intervention recordings, i.e., recordings of outcomes prior to the interventional procedure
	Immediate post-intervention recordings, i.e., recordings of outcomes within 2 weeks after the completion of the interventional procedure
	Long-term post-intervention recordings, i.e., recordings of outcomes more than 2 weeks after the completion of the interventional procedure.
Setting/Country	Private practice: stakeholders treated or working in a private practice
	University setting: stakeholders treated or working in a university clinic Country: stakeholders treated or working in a specific country
Research design	Surveys or questionnaires: outcomes obtained through either surveys or questionnaires
	Interviews: outcomes obtained from interviews with stakeholders
	Focus groups: outcomes obtained from focus groups with stakeholders