该假设的反对者指出他们之间的联系不是因果关系。
Critics of the hypothesis point out that correlation is hardly causation.
不过，目前尚无足够的证据支持抑郁与随后的痴呆有直接因果关系的假设。
However, there is insufficient evidence at present to support the hypothesis that depression has a direct causal relationship with subsequent dementia.
此外还有其他有关数据质量和与假设因果关系等遁词。
There are other quibbles to do with the quality of the data and assumptions about cause and effect.
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