The quality of evidence for medical interventions does not improve or worsen: a metaepidemiological study of Cochrane reviews.
Howick Jeremy, Koletsi Despina, Pandis Nikolaos, +5 more·Journal of clinical epidemiology
OBJECTIVES: The objective of the study was to determine the change in quality of evidence in updates of Cochrane reviews that were initially published between January 1, 2013 and June 30, 2014. We used the Grading of Recommendations, Assessment, Development and Evaluation (GRADE) system to document evidence qualit…