There were some socio-demographic differences between
our sample and the population. Compared with
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the overall University population, our sample had a
higher frequency of females (sample: 57.3%; population:
54.6%), was younger (21.5 y vs 21.9 y), and had a higher
proportion of undergraduates (62% vs 59%). Overall, these
differences were small and do not indicate a systematic
tendency towards more or less frequent drinking: women
generally drink less than men and undergraduates generally
drink more than postgraduates.