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) |