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实验研究大多可分为说明性和分析性两类。说明性实验的信息来源于同一组实验对象,其目的在于揭示影响某种疾病的因素或随时间变化的后果,分析性实验是通过与对照组(接受标准治疗或根本不予治疗)比较来评价对疾病的真正疗效,力求以数量表示。
Most experimental studies can be divided into two kinds of illustrative and analytical. The informative experiment is derived from the same group of subjects for the purpose of revealing the effects of a disease or the consequences of changes over time. Analytical experiments are evaluated by comparison with controls (with or without treatment) The true efficacy of the disease, sought to quantify.