Table 2

Effectiveness reviews illustrating study selection in a flow diagram

All systematic reviews of therapeutic interventions: any flow diagram


N reviews

n flow diagrams (%)

Citation to study relationship (% of all diagrams)

Citation to study relationship: % of all reviews


2001

18

7 (38.9)

2 (28.6)

11.1

2002

22

8 (36.4)

5 (62.5)

22.7

2003

15

8 (53.3)

3 (37.5)

20.0

2004

19

13 (68.4)

6 (46.2)

31.6

2005

13

7 (53.8)

4 (57.1)

30.8

2001–05

87

43 (49.4)

20 (46.5)

23.0


Systematic reviews containing a meta-analysis: any flow diagram


N reviews

n flow diagrams (%)


2001

7

1 (14.3)

2002

10

2 (20)

2003

5

1 (20)

2004

9

5 (55.6)

2005

7

3 (42.9)

2001–05

38

12 (31.6)


Hind and Booth BMC Medical Research Methodology 2007 7:49   doi:10.1186/1471-2288-7-49

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