How explicable are differences between reviews that appear to address a similar research question? A review of reviews of physical activity interventions

Table 4 Overlap between primary studies included in reviews

Number of times each study included^a	Total	Citation for studies
Included in 1 review	22	[24, 25, 41–60]
Included in 2 reviews	4	[39, 61–63]
Included in 3 reviews	0
Included in 4 reviews	0
Included in 5 reviews	2	[26, 35]
Total studies included in any review	28^b

^aThe unit of analysis is the study (not publication). Where a study has multiple publications and review authors have included at least one of the publications, we have judged this study to be ‘included’ (Table 3).
^bThis table is based on 28 primary studies, including the two without an available abstract.

ISSN: 2046-4053