[Comparing two groups of patients].
In medical research, comparing two groups of patients occurs frequently. The basic principles of comparison and the usual statistical tests--according to the types of variables and the choices of sampling methods--are presented. Elements needed for the computation of the size of a comparative study are given.
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MCU-PH biostatistiques et informatique médicale, Inserm U444, hôpital Saint-Antoine, Paris, France.
D006801:Humans; D008432:Mathematical Computing; D012107:Research Design; D018401:Sample Size