Intervention studies

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Intervention studies

are considered to provide the most reliable evidence in epidemiological research.  Intervention studies are conducted to evaluate whether an agent (i.e. moderate consumption of alcoholic beverages in the meta-analysis above) or procedure reduces the risk of developing a particular disease among individuals free from that disease at the beginning of the trial. In intervention trials, investigators apply treatments to individuals and then proceed to observe the effect of the treatments on the individuals (see observational studies).

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