Few Studies Reporting Results at US Government Clinical Trials Site, February 15, 2012 — JAMA

"Fewer than one-quarter of the clinical trials registered at ClinicalTrials.gov (http://clinicaltrials.gov), a federal database set up to provide public information about clinical trials, have had their results posted in the database within a year of publication, 2 recent analyses have found."

“We wanted to highlight to the research community that reporting of some clinical trials information is mandatory,” said Andrew P. Prayle, MDChB, a doctoral research fellow at the United Kingdom's National Institute for Health Research and an author of one of the analyses (Prayle AP et al. BMJ. 2011;344:d7373 [published online January 3, 2012]).