Table 1

Characteristics of 123 trials rejected for registration deficiencies

#%
Registration deficiency
 Retrospective11089.4
 Unregistered97.3
 Registered in unapproved registry32.4
 Other (mistaken as unregistered)1<1
Funding source
 Single funder9577.2
 Combination2822.8
Funding type*
 Government8266.6
 Foundation3326.8
 Academic2217.9
 Industry75.7
 No funding54.1
 Unknown64.9
Year submitted
 201375.7
 20142722.0
 20153629.3
 20162621.1
 20172722.0
Registry
 CT.gov5548.2
 ISRCTN3026.3
 NTR76.1
 ANZCTR76.1
 EudraCT32.6
 ChiCTR32.6
 PACTR21.8
 German CTR21.8
 UMIN10.8
 AEARCTR10.8
 CTRI10.8
  • *Projects could have more than one source of funding, so numbers do not add to 123 and percentages do not sum to 100%.

  • AEARCTR, American Economic Association RCT Registry; ANZCTR, Australian New Zealand Clinical Trials Registry; ChiCTR, Chinese Clinical Trial Registry; CT.gov, ClinicalTrials.gov; CTRI, Clinical Trials Registry—India; EudraCT, European Clinical Trials Database, approved registry only for trials registered after 20 June 2011; German CTR, German Clinical Trials Registry; ISRCTN, International Standard Randomised Controlled Trial Number Registry; NTR, Netherlands Trial Registry; PACTR, Pan African Clinical Trials Registry; UMIN, University Hospital Medical Information Network Clinical Trials Registry (Japan).