Aims
To investigate how gender composition of the drinking group affects young adults’ alcohol consumption on weekend evenings over and above the effect of drinking-group size.
Design
Using the Internet-based cell phone-optimized assessment technique (ICAT), participants completed online questionnaires on their cell phones every hour from 8 p.m. to midnight on Thursday, Friday, and Saturday evenings over five consecutive weekends.
Setting
French-speaking Switzerland.
Participants
Convenience sample of 183 young adults (53.0% female, mean age=23.1) who completed a total of 4,141 hourly assessments.
Measurements
Alcohol consumption and number of male and female friends present assessed at 8 p.m., 9 p.m., 10 p.m., 11 p.m., and midnight.
Findings
Results of three-level negative binomial regression analyses showed that women consumed significantly more drinks per hour when drinking in mixed-gender groups (z-values ranging from 2.9 to 5.3, all p<.01) and significantly fewer drinks when drinking with men only (z=−2.7, p<.01), compared with drinking with women only. Men reported consuming more drinks per hour in mixed-gender groups of equal gender composition (z=2.4, p<.05) or mixed-gender groups with men in the majority (z=2.2, p<.05), and fewer hourly drinks when drinking with women only (z=−4.9, p<.001), compared with drinking with men only. Drinking-group size predicted the hourly number of drinks for women (z=6.0, p<.001) and men (z=5.5, p<.001).
Conclusions
Drinking-group gender composition is associated with number of drinks consumed per hour, over and above the impact of the drinking-group size. Young adults report consuming more drinks per hour when drinking with mixed-gender groups than with same-gender groups.