Skip to main content

Table 1 Characteristics of included studies: number and percentage of included articles/studies by journal in which the article was published, trial registry in which the trial was registered, study design, continent of the first authors’ affiliation, and presence or absence of a declared financial competing interest

From: When are clinical trials registered? An analysis of prospective versus retrospective registration

Study characteristics All studies (% of total 108)
Journal in which published
 - BMC Anaesthesiology 1 (1)
 - BMC Cancer 2 (2)
 - BMC Complementary and Alternative Medicine 10 (9)
 - BMC Cardiovascular Disorders 2 (2)
 - BMC Dermatology 1 (1)
 - BMC Emergency Medicine 3 (3)
 - BMC Endocrine Disorders 1 (1)
 - BMC Family Practice 11 (10)
 - BMC Gastroenterology 8 (7)
 - BMC Geriatrics 9 (8)
 - BMC Health Services Research 5 (5)
 - BMC Infectious Diseases 6 (6)
 - BMC International Health and Human Rights 1 (1)
 - BMC Medicine 7 (6)
 - BMC Musculoskeletal Disorders 2 (2)
 - BMC Nephrology 9 (8)
 - BMC Pediatrics 8 (7)
 - BMC Pregnancy and Childbirth 4 (4)
 - BMC Psychiatry 7 (6)
 - BMC Public Health 9 (8)
 - BMC Pulmonary Medicine 2 (2)
Trial registry
 - ANZCTR 11 (10)
 - CHiCTR 3 (3)
 - Clinicaltrials.gov 63 (58)
 - DRKS 3 (3)
 - IRCT 2 (2)
 - ISRCTN 15 (14)
 - NTR 4 (4)
 - UMIN-CTR 4 (4)
Study design
 - RCT 83 (77)
 - Pilot RCT 12 (11)
 - Interventional, non-randomised 13 (12)
Continent of affiliation (first author)
 - Africa 2 (2)
 - Asia 24 (22)
 - Australia 11 (10)
 - Europe 51 (47)
 - North America 14 (13)
 - South America 6 (6)
Financial competing interests (CI) of any author
 - Financial CI declared 16 (15)
 - No financial CI declared 92 (85)