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Table 2 Distribution of demographic variables within the protocols assessed (n = 101)

From: The citation of relevant systematic reviews and randomised trials in published reports of trial protocols

Characteristics of assessed protocols

Total

N (101)

%

Journal

 Annals of Translational Medicine

1

1.0

 BMC umbrella journals

23

22.7

 BMJ Open

15

14.8

 Clinical and Translational Allergy

1

1.0

 Contemporary Clinical Trials

4

4.0

 Danish Medical Journal

1

1.0

 Implementation Science: IS

1

1.0

 JAMA Surgery

1

1.0

 JMIR Research Protocols

2

2.0

 Journal of Advanced Nursing

3

3.0

 Journal of Diabetes Science and Technology

1

1.0

 Nutrients

1

1.0

 Reproductive Health

1

1.0

 Springer Plus

1

1.0

 The Journal of Cardiovascular Nursing

1

1.0

 Trials

44

43.5

Subject

 Behavioural

49

48.5

 Biological or vaccine

1

1.0

 Dietary supplement

6

5.9

 Drugs

18

17.8

 Surgery or procedure

14

13.9

 Other

13

12.9

No. centres (according to authors’ affiliations)

 Multi-centre

85

84.2

 Single-centre

16

15.8

Continent of authorship

 America

19

18.8

 Europe

55

54.5

 Asia and other

27

26.7

No. sites (based on trial conduct)

 Multiple

52

51.5

 Single

49

48.5

Trial design

 Parallel

74

73.3

 Cluster

10

9.9

 Non-inferiority

5

5.0

 Superiority

2

2.0

 Other (or mixed-type designs)

10

9.8

Type of funding

 Non-industry

83

82.2

 Part industry

5

4.0

 Industry

7

6.9

 None/unknown

6

5.9

Conflict of interest

 No

77

76.2

 Yes

19

18.8

 Not described

4

4.0

 Unclear

1

1.0

Data sharing

 Data upon request

7

7.0

 Data stored in central repository

1

1.0

 No information provided

93

92.0

Total

101

100.0