While there's a definite rule for what's considered 1 drink (.6 fluid ounces of pure alcohol, regardless of the drinks alcoholic concentration), I doubt many people who responded to the questionnaires in these studies are aware of that.
Not really. That's a glass of wine with dinner, or a cocktail or beer after work. As with anything, the dose makes the poison, and that's a pretty small dose.
While there's a definite rule for what's considered 1 drink (.6 fluid ounces of pure alcohol, regardless of the drinks alcoholic concentration), I doubt many people who responded to the questionnaires in these studies are aware of that.