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Amid ongoing calls for greater clinical trial transparency, a new analysis finds just 40% of study results were reported to a U.S. database within a required one-year deadline, although sponsors did a better job of complying with several other mandates.

For instance, 89% of nearly 8,900 trials were registered with ClinicalTrials.gov on a timely basis and registration data was verified annually in 76% of the studies. In addition, protocols and statistical analysis plans were submitted in nearly all of the trials, but only two-thirds indicated sponsors made timely requests to delay reporting the results.

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