During the period of lifetime heaviest drinking, males, compared to females, reported higher levels of mean [SD] drink frequency (13.9 days/month [10.2] versus 8.0 [8.4]), regular quantity (6.2 drinks/day [6.2] versus 3.0 [2.3]), maximum quantity (13.2 drinks/day [10.5] versus 5.2 [4.0]), and drunk frequency (using the categories outlined above) (5.8 [2.9] versus 4.2 [2.9]), corresponding to about once a month for males and a few times a year for females.
