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Table 1 Agreement between conference abstract and ClinicalTrials.gov register on design of randomized comparison (n = 154 abstract-ClinicalTrials.gov pairs)

From: ClinicalTrials.gov registration can supplement information in abstracts for systematic reviews: a comparison study

Abstract

ClinicalTrials.gov

Parallel

Cross-over

Cluster

Within person*

Factorial

Other

Total number of pairs

Parallel

97

5

0

1

2

7

112

Cross-over

1

20

0

0

1

0

22

Cluster

0

0

1

0

0

0

1

Within person*

8

1

0

6

0

1

16

Factorial

0

0

0

0

0

0

0

Other

2

1

0

0

0

0

3

Total number of pairs

108

27

1

7

3

8

154

  1. * Trials in which the unit of randomization is not the individual, but an organ or part of the body (e.g., eyes).