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In my recent commentary [1] on the risk drinking article by Gmel et al. [2], I illustrated the fact that the frequency of risky single-occasion drinking (RSOD) takes on a different theoretical range at different volumes of intake.

Unfortunately, I included the inaccurate statement that individuals with average daily volumes of five drinks or greater necessarily engage in RSOD on all their drinking days, which of course is not the case. Rather, the possible frequencies of RSOD necessarily exclude zero, and they are unlikely to be lower than two to three times a week. The higher the average daily volume, the greater is the likelihood of daily RSOD and the smaller the possible range of frequencies.

I hope that any confusion caused by this misstatement does not detract from the central message of my commentary, and indeed of the original article by Gmel et al. [2], which was to highlight both the difficulty and the importance of disaggregating the effects of heavy volume and RSOD.

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