Does the serving-size of beer glasses matter for how much students drink on a night out?

INTERVENTION: At a regular quiz night in a large student dormitory bar in Copenhagen, Denmark, beer glasses of two different sizes are placed in a randomised sequence under the bar desk. This allowed for randomly allocating the 103 participating students into two groups either served free beer with standard 50 cl serving size (n = 54) or smaller 40 cl serving size (n = 49) during the first 2.5 hours of the student event. Consumption is measured by writing the students’ names on their glasses and then videotaping the glasses served from cameras placed underneath the bar desk and monitoring the students throughout the night. CONDITION: Excessive alcohol consumption ; Not Applicable PRIMARY OUTCOME: Beer served measured in centiliters by having bartenders pour beer to a particular line on the beer glasses and recording this with go‐pro cameras during the first 2.5 hours of the student event SECONDARY OUTCOME: There are no secondary outcome measures INCLUSION CRITERIA: Guests at a dormitory bar