title: [Levels of evidence value are useful in the evaluation of studies and results].
abstract: A classification of scientific evidence into 'levels', in which the type of research design is graded according to its strength, is useful because it helps the medical community to sort out a system that is accepted all over the world. It not only makes the highest levels of evidential value explicit for a particular clinical question, but also makes the lack of evidence visible. Selected articles will contain labels identifying the strength of evidence supporting key recommendations.
authors.affiliation: Kwaliteitsinstituutvoor de Gezondheidszorg CBO, Postbus 20.064, 3502 LB Utrecht. j.vaneverdingen@cbo.nl
authors.forename: J J E
authors.initials: JJ
authors.lastname: van Everdingen
mesh_terms: D019317:Evidence-Based Medicine / Q000592:standards; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D012106:Research