Table 3.

Variables that we propose to extract, by over-arching category

Category	Variable
Characteristics of the study authors	Surnames
	Countries (that authors’ primary institutional affiliations are located in)
	Lens/disciplinary points of view
Characteristics of the publication	Study name
	Publication year
	Journal
	Published (yes/no)
Characteristics of the model/framework	Name
	Purpose/aim
	Population developed in/for
	Targeted stage of research process
	Elements (description)a
	Proposed relations between elementsa
	Location on spectrum of engagement [22]
	Strengths and weaknesses (stated in study)

^aThese data directly address our research question