Table 1

Characteristics of the Included Systematic Reviews

Characteristic

n (total = 105)

%


Year of publication or substantive update

Median

2001

Interquartile range

1999–2001

Focus of the review

Treatment

89

84.8

Prevention

14

13.3

Diagnosis

1

1.0

Other

1

1.0

Study designs included

RCT only

55

52.4

RCT and qRCT

39

37.1

RCT and other controlled trials

11

10.5

Meta-analysis undertaken

78

74.3

Review groups with 4 or more included reviews*

Musculoskeletal Injuries

22

21.0

Eyes and Vision

12

11.4

Renal

9

8.6

Prostatic Diseases and Urologic Cancers

8

7.6

Back

6

5.7

Schizophrenia

6

5.7

Depression, Anxiety and Neurosis

5

4.8

Infectious Diseases

4

3.8

Upper Gastrointestinal and Pancreatic Diseases

4

3.8

Other

29

27.6

Number of included studies per review

Median

12

Interquartile range

5.0–19.5


Other group representation is as follows: Menstrual Disorders, Skin (3 reviews each), Effective Practice and Organisation of Care, Gynaecological Cancer, Heart, Hepato-Bilary, Hypertension, Lung Cancer (2 reviews each), Acute Respiratory Infections, Colorectal Cancer, Drugs and Alcohol, Ear, Nose and Throat, Fertility Regulation, HIV/AIDs, Metabolic and Endocrine Disorders, Movement Disorders, Oral Health, Pregnancy and Childbirth, Stroke (1 review each).

Sampson et al. BMC Medical Research Methodology 2006 6:33   doi:10.1186/1471-2288-6-33

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