title: Correlates of alcohol consumption on heavy drinking occasions of young risky drinkers: event versus personal characteristics.
abstract: OBJECTIVE
  Risky single-occasion drinking (RSOD) by young people is a serious public health issue, yet little is known about the specific circumstances of risky drinking occasions. This study examined the independent effects of event- and individual-specific variables on RSOD.
  
  
  METHODS
  Longitudinal cohort study measuring self-reported RSOD and event- and individual-specific variables across two drinking occasions approximately 1 year apart.
  
  
  METHODS
  Metropolitan Melbourne, Australia.
  
  
  METHODS
  A sample of 710 young risky drinkers aged between 18 and 25 years and defined as engaging in risky drinking practices (males: consumed alcohol in excess of 10 Australian Standard Drinks (ASD: 10 g ethanol) in a single occasion in the previous year; females: consumed alcohol in excess of seven ASD for females in a single occasion in the previous year).
  
  
  METHODS
  Random digit-dial telephone landline survey of the most recent heavy drinking occasion and socio-demographic variables. The primary outcome was the log of the total drinks consumed in the most recent heavy drinking occasion. Event-specific (e.g. number of drinking locations) and time-varying (e.g. weekly income) and time-invariant (e.g. sex) individual-specific variables were examined as correlates of total drinks consumed.
  
  
  RESULTS
  Changes in event-specific characteristics including the length of the drinking occasion (Likelihood Ratio χ2(2) = 24.4, P < 0.001), the number of drinking locations (Wald χ2(1)= 7.6, P = 0.006) and the number of different drink types (Wald χ2(1)= 13.6, P < 0.001) were associated with increases in total drinks consumed, after adjustment for time-invariant and time-variant individual-specific variables such as gender, income level and weekly consumption. Few other effects were noted.
  
  
  CONCLUSIONS
  Event-specific characteristics are important predictors of the number of drinks consumed during risky single occasion drinking (RSOD) and illustrate the importance of event contexts when considering interventions targeting RSOD. The total number of drinks consumed in a RSOD session appears to rise independently with the duration of the drinking event, the number of drinking locations and the number of different types of beverage consumed.
authors.affiliation: Burnet Institute, Melbourne, VIC, Australia.|School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia.
authors.forename: Paul
authors.initials: P
authors.lastname: Dietze
authors.affiliation: Burnet Institute, Melbourne, VIC, Australia.|School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia.|Judith Lumley Centre, La Trobe University, Melbourne, VIC, Australia.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Agius
authors.affiliation: Centre for Alcohol Policy Research, La Trobe University, Melbourne, VIC, Australia.
authors.forename: Michael
authors.initials: M
authors.lastname: Livingston
authors.affiliation: Centre for Alcohol Policy Research, La Trobe University, Melbourne, VIC, Australia.
authors.forename: Sarah
authors.identifier: http://orcid.org/0000-0003-4146-1244
authors.initials: S
authors.lastname: Callinan
authors.affiliation: Burnet Institute, Melbourne, VIC, Australia.|School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia.
authors.forename: Rebecca
authors.initials: R
authors.lastname: Jenkinson
authors.affiliation: Burnet Institute, Melbourne, VIC, Australia.|School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia.|Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC, Australia.
authors.forename: Megan S C
authors.initials: MSC
authors.lastname: Lim
authors.affiliation: Burnet Institute, Melbourne, VIC, Australia.|School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC, Australia.
authors.forename: Cassandra J C
authors.initials: CJC
authors.lastname: Wright
authors.affiliation: Centre for Alcohol Policy Research, La Trobe University, Melbourne, VIC, Australia.|Centre for Social Research on Alcohol and Drugs, Stockholm University, Stockholm, Sweden.
authors.forename: Robin
authors.initials: R
authors.lastname: Room
mesh_terms: D000293:Adolescent; D000328:Adult; D000428:Alcohol Drinking / Q000453:epidemiology*; D001315:Australia / Q000453:epidemiology; D063425:Binge Drinking / Q000453:epidemiology*; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D012309:Risk-Taking; D057566:Self Report; D055815:Young Adult
keywords: Alcohol; binge drinking; drinking; event-level analysis; longitudinal study; risky drinking events; young people