However, it did not exclude any external influnces or possible skewing of groups, such as financial status, marital status, and a whole host of other factors.
First of all, I need to get a direct reference of Ms Calderone actually saying that because what is missing (as indicated by the ellipsis) can be important. Secondly, was she talking about the situation in the US? There is no reference inside the quotation to indicate one way or another.
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