Fewer than half of medical clinical trials published in the last year in leading medical journals are reported on the government site ClinicalTrials.gov, according to a new study published by the Journal of the American Medical Association (JAMA).

According to the study, despite a 2005 requirement by medical journal editors that researchers register their studies online before acceptance in a major journal, just 147 out of 323 articles published in the past year were properly registered before the end of the trial. To meet the requirement, researchers are supposed to state what outcomes they will measure to figure out ...