Table 4. Methods of included papers, in order of quantity.

Multiple papers from the same study were counted as having a single study methods. Three companion papers were not counted in the ‘total quantity’ column. Many papers used multiple methods, each counted separately in the ‘quantity’ column.

Type of study	Total quantity	Method	Quantity
Qualitative	49	Interviews	40
		Focus groups	8
		Questionnaire/survey	4
		Observations	2
		Descriptive study	2
		Workshops	1
Quantitative	10	Questionnaire/survey	6
		Experience Sampling Method	1
		Observations	1
		Panel study	1
		Randomised study	1
Mixed	6	Interviews	5
		Questionnaire/survey	5
		Focus groups	3