title: Does one day of drinking matter? 21st birthday drinking predicts subsequent drinking and consequences.
abstract: There has been ample research on college student risks and consequences related to 21st Birthday Drinking. To date, no studies we are aware of have examined how 21st birthday drinking impacts subsequent drinking and related consequences. This study evaluates the effect of a single night of drinking on peak drinking, heavy drinking, and negative consequences over 12months following the event. Furthermore, we examine if typical drinking behavior prior to 21st birthday moderates the relationship between the event drinking and subsequent use.
  
  
  
  Participants included 599 college students (46% male) who intended to consume at least five/four drinks (men/women respectively) on their 21st birthday. Screening and baseline assessments were completed approximately four weeks before turning 21. A follow-up assessment was completed approximately one week after students' birthdays and every 3months for one year thereafter.
  
  
  
  Those who drank more on their 21st birthday, also reported higher peak consumption, increased likelihood of consequences, and increased number of consequences throughout the year. Additionally, baseline peak drinking moderated the relationship such that those who drank less at peak occasion prior to turning 21 showed the strongest effects of 21st BD drinking on subsequent consumption.
  
  
  
  21st BD drinking could impact subsequent choices and problems related to alcohol. Interventions are warranted and implications discussed.
authors.affiliation: Center for the Study of Health and Risk Behaviors, Department of Psychiatry and Behavioral Sciences, University of Washington, 1100 NE 45th Street, Suite 300, Seattle, WA 98105, USA. Electronic address: geisner@uw.edu.
authors.forename: Irene M
authors.initials: IM
authors.lastname: Geisner
authors.affiliation: Center for the Study of Health and Risk Behaviors, Department of Psychiatry and Behavioral Sciences, University of Washington, 1100 NE 45th Street, Suite 300, Seattle, WA 98105, USA.
authors.forename: Melissa A
authors.initials: MA
authors.lastname: Lewis
authors.affiliation: Center for the Study of Health and Risk Behaviors, Department of Psychiatry and Behavioral Sciences, University of Washington, 1100 NE 45th Street, Suite 300, Seattle, WA 98105, USA.
authors.forename: Isaac C
authors.initials: IC
authors.lastname: Rhew
authors.affiliation: Center for the Study of Health and Risk Behaviors, Department of Psychiatry and Behavioral Sciences, University of Washington, 1100 NE 45th Street, Suite 300, Seattle, WA 98105, USA.
authors.forename: Angela J
authors.initials: AJ
authors.lastname: Mittmann
authors.affiliation: Center for the Study of Health and Risk Behaviors, Department of Psychiatry and Behavioral Sciences, University of Washington, 1100 NE 45th Street, Suite 300, Seattle, WA 98105, USA.
authors.forename: Mary E
authors.initials: ME
authors.lastname: Larimer
authors.affiliation: Center for the Study of Health and Risk Behaviors, Department of Psychiatry and Behavioral Sciences, University of Washington, 1100 NE 45th Street, Suite 300, Seattle, WA 98105, USA.
authors.forename: Christine M
authors.initials: CM
authors.lastname: Lee
mesh_terms: D000328:Adult; D000428:Alcohol Drinking / Q000453:epidemiology* / Q000523:psychology; D000437:Alcoholism / Q000453:epidemiology* / Q000523:psychology; D000846:Anniversaries and Special Events; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D013334:Students / Q000523:psychology / Q000706:statistics & numerical data*; D014495:Universities; D055815:Young Adult
keywords: 21st birthday; Alcohol; Alcohol-related problems; College students; Event-specific drinking