title: [Levels of scientific evidence and strength of clinical recommendations. From trials to guidelines. The Italian Group on Medicine Based on Evidence--(GIMBE)].
abstract: Evidence-based medicine is a new paradigm of clinical practice that promotes the collection, interpretation and integration of valid, important and applicable to patients research-derived evidence, and it can improve the efficiency and the effectiveness of health care. Nevertheless research often fails to get in clinical practice, also because the traditional tools used by physicians to solve clinical problems are less reliable as the volume/complexity of medical information and biomedical technology have grown exponentially. New tools are emerging to help physicians: the systematic reviews of randomized controlled trials and the clinical practice guidelines that summarize a great volume of medical knowledge to improve health care. Practice guidelines, with a systematic review or meta-analysis pertaining to a definite health problem, summarize the evidence of clinical trials in clinical recommendation. These combine the strength and heterogeneity of the primary studies with magnitude and precision of the treatment effects as it relates to the minimal clinical benefit. The recommendation may suggest therapeutic intervention when the baseline risk is high or otherwise when the baseline risk is low. The Authors discuss principles of evidence-based medicine, measures of treatment effectiveness, systematic reviews and methods used by experts to graduate the strength of clinical recommendations in producing practice guidelines.
authors.affiliation: Istituto di Medicina Interna e Geriatria, Cattedra di Medicina Interna, Università, Palermo. gimbe@tin.it
authors.forename: A
authors.initials: A
authors.lastname: Cartabellotta
authors.forename: G
authors.initials: G
authors.lastname: Montalto
authors.forename: A
authors.initials: A
authors.lastname: Notarbartolo
mesh_terms: D006801:Humans; D019317:Evidence-Based Medicine; D016017:Odds Ratio; D017410:Practice Guidelines as Topic; D016032:Randomized Controlled Trials as Topic; D012307:Risk Factors; D000078202:Systematic Reviews as Topic