Из материалов и методов:
...number of binge episodes defined as consumption of more than four drinks in an episode.
Только сколько они имеют в виду под "drink"? Вот такое есть:
In the United States, one "standard" drink (or one alcoholic drink equivalent) contains roughly 14 grams of pure alcohol, which is found in: 12 ounces of regular beer, which is usually about 5% alcohol. 5 ounces of wine, which is typically about 12% alcohol. 1.5 ounces of distilled spirits, which is about 40% alcohol.
ounce
(in Britain and North America) a unit for measuring weight, 116 of a pound, equal to 28.35 grams
fluid ounce
a unit for measuring liquids, equal to 0.028 of a litre in the UK and some other countries, and 0.03 of a litre in the US.