Although in general, the AHS cohort has been found to have provided valid (Hoppin et al. 2002) and reliable (Blair et al. 2002) estimates of exposure, inaccurate recall is undoubtedly a limitation and would introduce random exposure misclassification, which would attenuate the RR (Greenland 1980).
The result of this misclassification would probably attenuate the relation between migraine with aura and mortality.
However, this type of exposure misclassification would likely attenuate rather than inflate associations with the outcome.
This inaccuracy presented an unacceptable risk of misclassification, that collapsing into regions would attenuate.
The reliance on self-report measures may have led to misclassification of sitting, which, if nondifferential, would attenuate the association between sitting and obesity risk toward the null.
For both outcomes, it seems unlikely that misclassification of disease status was influenced by degree of phthalate exposure, and such nondifferential misclassification would have attenuated our findings.
Given the highly stigmatised and criminalised nature of sex work and our qualitative work to date, however, under-reporting of violence episodes would be more likely than over-reporting and thus any misclassification would have attenuated estimates towards the null.
Misclassification of non-stroke cases as stroke cases would attenuate the association between health behaviours and stroke risk.
To the best of our knowledge, the use of any other pesticides in fogger trucks before the DDT ban is unknown and any exposure misclassification resulting from the use of alternative pesticides would attenuate any effect on breast cancer risk, which we assume is attributable to DDT.
However, this misclassification is likely to be non-differential and, if anything, would attenuate and underestimate any effect of deprivation.
