Table 2 Characteristics of included abstracts from both periods

Title

32.4

56.6

<0.001

Authors (for conference abstracts)

N/A

N/A

–

Trial design

22.7

16.3

0.130

 Participants

41.1

44.0

0.58

 Setting^a

41.1

44.0

0.58

 Interventions

92.4

81.9

0.003

 Objective

93.5

95.2

0.50

 Outcome

31.4

49.4

0.001

 Randomization

1.1

1.8

0.57

 Blinding (masking)

3.2

4.2

0.63

 Number randomized

41.6

37.4

0.41

 Recruitment

2.7

4.2

0.44

 Number analyzed

4.3

8.4

0.113

 Outcome

4.9

16.9

<0.001

 Effect size^a

4.9

20.5

<0.001

 Harms

11.9

27.7

<0.001

 Conclusion

97.3

97.0

0.86

 Trial registration

13.5

42.2

<0.001

 Funding

1.6

13.9

<0.001