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" ... One limitation of the study is its poor demographic representation. Particularly, a large majority of participants were white (86.3%) and non-hispanic (82.9%). This is not representative of the country over all. There is no reason to believe that other demographics were excluded from the study: these are just the people who chose to participate given the opportunity. But, strictly speaking, statistical generalization to the larger population is questionable. That said, the authors of the study did a sensitivity analysis to look at effects of sex, age, ethnicity, and occupation. The effects of these covariates were found to be minimal. ... "