The goal was not to compare men to women or ethnicities to one another, but to assess the effect of PFASs on Rubella within group to assure that highly significant effects in one sex /ethnicity group had not generalized to all.
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Rubella immunity and serum perfluoroalkyl substances: Sex and analytic strategy.
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The sentences
There was no significant effect of PFASs on immunity in youths but a significant effect of both PFOA and PFOS in adults, as well as a significant interaction of PFOA x sex and a borderline significant interaction of PFOS x sex.