need preliminary data for an experimental design.
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送交者: cornbug 于 2013-06-18, 23:05:56:
回答: 吃毒的和没有吃毒的 由 whatistruth 于 2013-06-18, 22:49:22:
If the preliminary data show that the life span decreases in China, it implies the poisoning may be a contributing factor. Reversely, the adaptation mechanism may kick in. This postulate can only be evaluated with a long run study design in a large scale of population (to remove the bias).
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