PSYC 3690 Chapter Notes -Blood Alcohol Content, Randomized Controlled Trial, Bacs

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Published on 14 Apr 2013
School
University of Guelph
Department
Psychology
Course
PSYC 3690
Page:
of 2
Article #: 14
Title: Internet-Based Personalized Feedback to Reduce 21st-Birthday
Drinking: A Randomized Controlled Trial of an Event Specific
Prevention Intervention
Goals
- evaluation of a Web-based personalized ESP intervention targeting 21st birthday
drinking
- goal is to reduce alcohol consumption and blood alcohol concentration
- also aimed to evaluate social norms, intentions and protective behaviours as
mediators of intervention efficacy
Who Benefits? (Target Audience)
- university students who will soon be turning 21
Universal, Selective, or Indicated
- indicated - each participant was screened and was going to turn 21 and intended to
drink 2 or more drinks
Primary, Secondary, Tertiary
- primary - almost all 20 year olds received the treatment and the goal was to prevent
incidences of drinking extreme amounts of alcohol
- not secondary because there is no established disorder
Risk and Protective Factors
- risk = overestimating how much peers drink, intending to drink 2 or more drinks
- protective = limiting the numbers of drinks, avoiding drinking games, knowing where
oneʼs drink has been at all times, avoiding drinks that contain multiple shots)
Measures of Data Collection (what is measured, # of times, and how)
- baseline assessment 1 week before they turned 21
- randomly assigned to receive web-based personalized feedback or assessment only
- 2 days before their birthday and 1 day before their birthday students who were
randomized to intervention received an email with a link to the web-based
personalized feedback
- follow-up assessment approximately 1 week after the studentʼs birthday
- 21st birthday drinking intentions, actual birthday drinking and typical weekly drinking
was tested using a modified Daily Drinking Questionnaire
- intended BAC was estimated from a modification of the Widmark formula
- modification of the Protective Behavioural Strategies Scale was used to assess
protective behaviours
Intervention Strategies?
- feedback included normative information, protective behaviours and personalized
blood alcohol concentration information
- feedback about their intended number of drunks, the resulting intended BAC, and
effects of alcohol at varying BACS, they were also provided a printable personalized
BAC chart
- received graphic feedback regarding perceived and actual description norms for
drinking on 21st birthdays
- provided a list of protective behaviour strategies designed to encourage and aid in
moderation (setting a limit, spacing drinks, alternating alcoholic and nonalcoholic
drinks)
Results (what did the program accomplish)
- intervention was significant for reducing blood alcohol concentration
- primarily effective among those who intended to reach higher levels of intoxication
- some support for the reduction of normative perceptions of 21st birthday peer drinking
behaviour as a mediator of intervention efficacy
- event-specific personalized intervention can be effective at reducing heavy drinking
among college students during that event
- first empirically supported, entirely web-based prevention intervention to have been
found effective at reducing drinking behaviour
- reducing normative perceptions for peer 21st birthday drinking behaviour was
associated with lower BACs
- the intervention had no impact on protective behaviours but protective behaviours
were associated with lower intentions and drinking
Limitations
- intervention effects might be a result of having received any feedback, additional
attention or multiple reminders
- low participation rate at the screening survey
- inconsistency between how we assessed protective behaviour strategies intentions
and the content provided in the intervention
- self-reported BACs become less accurate with higher actual intoxication levels
Other Important Facts
- 3 box model
- normative information
- protective behaviours
- personal BAC information
- reduction of normative
perceptions associated
with peer drinking
- reduction in intention of
level of intoxication
- less alcohol consumption
- lower Blood Alcohol
Concentration

Document Summary

Drinking: a randomized controlled trial of an event speci c. Evaluation of a web-based personalized esp intervention targeting 21st birthday drinking. Goal is to reduce alcohol consumption and blood alcohol concentration. Also aimed to evaluate social norms, intentions and protective behaviours as mediators of intervention ef cacy. University students who will soon be turning 21. Indicated - each participant was screened and was going to turn 21 and intended to drink 2 or more drinks. Primary - almost all 20 year olds received the treatment and the goal was to prevent incidences of drinking extreme amounts of alcohol. Not secondary because there is no established disorder. Risk = overestimating how much peers drink, intending to drink 2 or more drinks. Protective = limiting the numbers of drinks, avoiding drinking games, knowing where one s drink has been at all times, avoiding drinks that contain multiple shots) Measures of data collection (what is measured, # of times, and how)