One can increase the value of statistical clinical study with a control group received a placebo, and the characteristics of this group should be as close as possible to those contained in the treated group (age, sex, and duration and the nature and severity of the disease, etc..) .. You can also disguise the nature of the treatment (drug or placebo) to the examiner, and the patient. This is known as a randomized, double-blind, placebo-controlled study. Determines the size and statistical power and the duration of study needed to get the correct results. Such clinical trials prove conclusively.
The results of the meta-analysis and more convincing. This type of study is to analyze the effectiveness and safety of treatment, based on the combined results of several clinical studies designed according to scientific protocol properly.
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