This strikes me as a "safe" psychology study, one virtually certain to produce a publishable outcome.<p>Surprisingly, the linked technical article, which was paid for with tax dollars, is paywalled -- isn't that practice supposed to end?<p>Without being able to read the article, I'll go out on a limb and guess that the article's data were collected by interviewing people, asking about their drinking habits. This is a very unreliable method compared to measuring people's blood alcohol levels -- granted that the latter design would be prohibitively expensive.<p>Anecdotal studies are notoriously unreliable. A young researcher once performed an interview-based study that showed married people live longer than single people. On reviewing the paper, an older, more experienced scientist suggested that public records would cost less and produce better results. The young scientist tried again, using actuarial data, and the original conclusion was falsified: married people don't live longer, <i>it just seems longer.</i>