This study evaluates within-person and between-person effects of a personalized normative feedback intervention and injunctive norms as they are altered by self-determination in heavy drinkers. Half of participants will receive personalized normative feedback and the other half will receive control feedback about media use habits.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
136
Participants will receive personalized normative feedback about drinking.
Participants will receive personalized normative feedback about social media use.
University of Houston
Houston, Texas, United States
Between-Person Self-Determination by PNF Interaction Predicting Consumption
A structural equation model will be fit with baseline consumption, self-determination, intervention condition, and the interaction between self-determination and condition predicting follow-up alcohol consumption. Consumption will be measured with the Alcohol Consumption Index, Quantity-Frequency-Peak Alcohol Use Index, and the Daily Drinking Questionnaire. These scales will be used as indicators of a single latent consumption variable. That latent consumption measure will be the outcome of interest.
Time frame: 2-4 Weeks
Within-Person Self-Determination by PNF Interaction Predicting Consumption
A multilevel model will be fit with baseline consumption, daily self determination, intervention condition, and the interaction between condition and daily self-determination predicting daily alcohol consumption. Consumption will be measured as the number of drinks consumed the previous evening.
Time frame: 17 Days
Between-Person Self-Determination by PNF Interaction Predicting Alcohol-Related Problems
A structural equation model will be fit with baseline consumption, alcohol-related problems, self-determination, intervention condition, and the interaction between self-determination and condition predicting follow-up alcohol-related problems. Alcohol-related problems will be measured with the Rutgers Alcohol Problems Index and the Young Adult Alcohol Consequences Questionnaire. Each of these problems measures will be split to form two indicators (for a total of four problems indicators) for an overall problems latent variable. This problems latent variable will then be used as the outcome of interest.
Time frame: 2-4 Weeks
Within-Person Self-Determination by PNF Interaction Predicting Alcohol-Related Problems
A multilevel model will be fit with baseline consumption, daily self determination, intervention condition, and the interaction between condition and daily self-determination predicting daily alcohol alcohol-related problems. Alcohol-related problems will be measured with a checklist of non-overlapping items from the Rutgers Alcohol Problems Index and the Young Adult Alcohol Consequences Questionnaire. This combined checklist will be used to create the overall problems outcome of interest.
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Time frame: 17 Days