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Effects of study design and allocation on self-reported alcohol consumption: randomized trial
Kypros Kypri1, Amanda Wilson2, John Attia3
1Centre for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health, University of Newcastle, Callaghan, NSW, 2308, Australia. kypros.kypri@newcastle.edu.au.
Participant perceptions of study type did not influence alcohol consumption, despite affecting engagement with educational materials. This suggests study framing may not impact behavior change in online interventions.
Area of Science:
- Psychology
- Public Health
- Behavioral Science
Background:
- Participant beliefs about study nature can influence behavior and introduce bias.
- Two hypotheses were tested regarding the impact of perceived study type on alcohol consumption.
Purpose of the Study:
- To determine if informing participants they are in an intervention trial affects reported alcohol consumption compared to a cohort study.
- To assess if participants in the intervention group of a trial report lower alcohol consumption than those in the control group.
Main Methods:
- 6,788 moderate to heavy drinking university students were randomized into 'cohort', 'control', or 'intervention' groups.
- All groups received identical online alcohol education materials; engagement was recorded.
- Alcohol intake was reassessed after one month.
Main Results:
- No significant differences in alcohol consumption were found between groups for either hypothesis.
- The 'intervention' group showed higher engagement (access and reading time) with educational materials compared to 'cohort' and 'control' groups.
- Point estimates for alcohol consumption were in the hypothesized direction but not statistically significant.
Conclusions:
- Study framing influenced engagement with online alcohol education but not drinking behavior.
- The lack of behavioral change may stem from limitations in the experimental design or the online intervention approach.
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