Revista portuguesa de cardiologia : orgão oficial da Sociedade Portuguesa de Cardiologia = Portuguese journal of cardiology : an official journal of the Portuguese Society of Cardiology
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The benefits of therapeutic interventions, whether pharmacologic, surgical, psychological, or others, are usually determined through clinical trials. The design of such trials involves the definition of a control group (placebo or active agent), which will be compared to one or more experimental groups (active agents). ⋯ We will present the concepts of RRR, ARR and NNT in a deliberately simple fashion, using published studies. On the basis of this knowledge the reader will be able to analyze the literature and make decisions based on it.