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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).