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Table 2 Registration of RCTs stratified by start of patient recruitment

From: Surgical trials and trial registers: a cross-sectional study of randomized controlled trials published in journals requiring trial registration in the author instructions

  Start of patient recruitment
All 2004 to 2005 During or after 2006 Unclear
n = 103 (100%) n = 15 (100%) n = 86 (100%) n = 2 (100%)
Registered RCTs 85 (83%) 14 (93%) 71 (83%) 0
Registration (number) mentioned in article 68 (80.0%) 11 (71.4%) 57 (70.4%)
Registration (number) not mentioned in article 17 (20.0%) 3 (21.4%) 14 (19.7%)  
Registered prospectively 15 (17.6%) 0 15 (21.1%)  
Registered retrospectively 45 (52.9%) 12 (85.7%) 33 (46.5%)  
Study start and registration within same month 21 (24.7%) 1 (7.1%) 20 (28.2%)  
Unclear time relation between study start and registration 4 (4.7%) 1 (7.1%) 3 (4.2%)  
Not registered 18 (17%) 1 (7%) 15 (17%) 2 (100%)
  1. RCT, randomized controlled trial.