Objective To estimate the frequency with which results of large randomized clinical trials
registered with ClinicalTrials. gov are not available to the public. Design Cross sectional …

Background Prospective trial registration is a powerful tool to prevent reporting bias. We
aimed to determine the extent to which published randomized controlled trials (RCTs) were …

Objectives To analyse developments (and their causes) in the number and proportion of
clinical trials that were registered in different parts of the world after the International …

Objective To evaluate clinical trial registration, reporting and publication rates for new drugs
by:(1) legal requirements and (2) the ethical standard that all human subjects research …

Objective To address the bias occurring in the medical literature associated with selective
outcome reporting, in 2005, the International Committee of Medical Journal Editors (ICMJE) …

Background Reduced intake and absorption of antioxidants due to pain and malabsorption
are probable causes of the lower levels of antioxidants observed in patients with chronic …

Objectives To evaluate the compliance with prospective registration and inclusion of the trial
registration number (TRN) in published randomised controlled trials (RCTs), and to analyse …

Objectives To determine the prevalence of registered trials and to evaluate the risk of bias
between registered and unregistered clinical trials. Study Design and Setting The Cochrane …

Context Since September 2005, the International Committee of Medical Journal Editors
(ICMJE) has required that randomised controlled trials (RCTs) are prospectively registered …

Background Studies measuring the completeness and consistency of trial registration and
reporting rely on linking registries with bibliographic databases. In this systematic review, we …