Randomised trials versus observational studies: is the comparative observational study a poor compromise or a perfect synthesis?
Overview of some fundamental designs for clinical trials and studies. Some tentative definitions are given in order to stimulate questions and perspectives for further research.
Gaus
W
W
Biometrie und Medizinische Dokumentation, Universität Ulm, Schwabstrasse 13, D-890785 Ulm, Germany. wilhelm.gaus@medizin.uni-ulm.de
D000529:Complementary Therapies / Q000592:standards*; D019317:Evidence-Based Medicine; D006801:Humans; D019370:Observation; D016032:Randomized Controlled Trials as Topic