Experimental studies 1st part. Clinical trial.

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Carlos Manterola & Tamara Otzen


Experimental studies are characterized by the assessment of effect of one or more interventions, usually comparatively with other intervention, or placebo; and the prospective nature of data collection and follow-up. Included in the term experimental studies, there are a variety of designs: Clinical trials (CT) and its variants, quasi-experimental studies and natural experiments. The aim of this manuscript is to report basic principles, characteristics and CT structure.

KEY WORDS: Experimental studies; Clinical trials; Controlled clinical trials; Clinical trial; Publication type; Random Allocation.

How to cite this article

MANTEROLA, C. & OTZEN, T. Estudios experimentales 1a parte. El ensayo clínico. Int. J. Morphol., 33(1):342-349, 2015.