“…Compared with other health-relevant behaviours, drinking has been characterized predominantly as a social activity and variations in drinking patterns are therefore expected to refl ect social aspects of alcohol consumption (Rehm et al, 1996). Investigations of drinking patterns provided evidence of differences between socio-demographic or drinking subgroups when addressing various issues such as heavy episodic drinking occasions (Bondy, 1996), settings (Rossow, 1996;Single and Wortley, 1993), types of beverages consumed (Goldberg et al, 1995), drinking partners (Demers, 1997), or variations in consumption during the day (Dawson, 1996). With respect to variations between days, results stem mainly from earlier work done in North America (Arfken, 1988;Argeriou, 1975;Cahalan et al, 1969;Cahalan and Room, 1974;Harford and Gerstel, 1981).…”