Table 4.

Synthesis methods used by meta‐studies of different confidence levels

Type of synthesis method	Number of meta‐studies	% of meta‐studies	21 low confidence meta‐studies		11 medium/high confidence Meta‐studies
			Number	%	Number	%
Quantitative synthesis methods	7	22	5	24	2	18
Narrative synthesis methods	17	53	12	57	5	45
Mixed quantitative‐narrative synthesis methods	8	25	4	19	4	37
Total	32	100	21	100	11	100