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Table 4 Results availability for registered RCTs stratified by completion date

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

  Study completion date
All Before or during February 2011 After February 2011 to February 2012 After February 2012 Unclear
n = 59 (100%) n = 24 (100%) n = 25 (100%) n = 5 (100%) n = 5 (100%)
Results posted 7 (12%) 5 (21%) 2 (8%) 0 0
Results posted only 2 (3%) 1 (4%) 1 (4%) 0 0
Results posted and link to publication provided by investigator 1 (2%) 0 1 (4%) 0 0
Results posted and automatic linkage via register identification 4 (7%) 4 (17%) 0 0 0
No results posted 52 (88%) 19 (79%) 23 (92%) 5 (100%) 5 (100%)
Link to publication provided by investigator only 1 (2%) 0 1 (4%) 0 0
Link to publication provided by investigator and automatic linkage via register identification 1 (2%) 0 1 (4%) 0 0
Automatic linkage via register identification only 27 (46%) 9 (38%) 15 (60%) 1 (20%) 2 (40%)
No results posted and no link provided 23 (39%) 10 (42%) 6 (24%) 4 (80%) 3 (60%)
  1. List of registries included in the ICTRP search portal (September 2013): Australian New Zealand Clinical Trials Registry (ANZCTR); ClinicalTrials.gov; European Union Clinical Trials Register (EU-CTR); International Standard Randomised Controlled Trial Number Register (ISRCTN); Brazilian Clinical Trials Registry (ReBec); Chinese Clinical Trial Registry (ChiCTR); Clinical Trials Registry - India (CTRI); Clinical Research Information Service (CRiS), Republic of Korea; Cuban Public Registry of Clinical Trials (RPCEC); German Clinical Trials Register (DRKS); Iranian Registry of Clinical Trials (IRCT); Japan Primary Registries Network (JPRN); Pan African Clinical Trial Registry (PACTR); Sri Lanka Clinical Trials Registry (SLCTR); and The Netherlands National Trial Register (NTR). ICTRP, International Clinical Trials Register Platform; RCT, randomized controlled trial.