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In most epidemiological studies examining migraine prevalence and socioeconomic status (SES), an inverse relationship has been found. One plausible explanation is that migraine leads to social selection — i.e., socioeconomic downward drift. The opposite theory is social causation — i.e., that factors associated with low SES increase the rate of new onset or duration of migraine. To test these hypotheses, investigators predicted that if social selection is at play, one would expect similar incidence and remission in different SES groups, whereas with social causation, one would expect a higher incidence or lower remission rate in groups with low SES. The analysis drew on data from a large, cross-sectional survey, the American Migraine Preval…