Table 1

Number of reviews by type of intervention

Year of publication

Type of intervention

Total number of reviews


Drug

Surgical/dental

Physical

Diagnostic/screening

Other


1994

5

0

0

0

0

5

1995

9

0

0

0

3

12

1996

9

6

2

0

5

21

1997

15

2

1

0

6

29

1998

18

2

0

0

4

23

1999

21

1

0

1

4

27

2000

13

2

1

0

2

17

2001

17

1

2

0

9

27

2002

19

7

3

0

11

40

2003

26

1

3

0

14

44

2004

12

1

1

0

3

17

Jan-Apr 2005

0

0

0

0

0

0

Total

164

20

13

1

56

256


The sum of reviews by intervention is greater than the total number of reviews because 5 reviews examined 2 (4 reviews) or 3 (1 review) types of intervention (e.g. drug and non-drug antihypertensive therapy)

Golder et al. BMC Medical Research Methodology 2006 6:3   doi:10.1186/1471-2288-6-3

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