Biomarker Feedback Intervention

• eCHECKUP TO GO (eCTG) (Behavioral): A brief, web-based program designed by San Diego State University to reduce high-risk drinking by providing personalized normative feedback regarding alcohol use, risk factors, and risks associated with drinking and accurate information about alcohol
• eCHECKUPTOGO + brief personalized alcohol biomarker feedback intervention (eCTG + TAC) (Behavioral): Participants will receive the eCHECKUPTOGO in addition to the transdermal alcohol concentration (TAC) personalized feedback. The TAC is a brief individually delivered intervention based on the principles of Motivational Interviewing and focuses on increasing students' motivation to reduce harmful drinking by drinking in a safer, less risky manner. Participants will receive information on their drinking (both from the TAC sensor and daily diary data). Participants will be asked about drinking events during the past 2 weeks (how reflective they were of typical patterns and if a night stood out as particularly negative). Students will receive information and visual representations about TAC rise rates and peaks, and then be shown how their drinking during the past 2 weeks maps onto those visuals.

Primary outcomes

• Examine changes in Transdermal Alcohol Concentration (TAC) rise rate [Baseline, 6 months]: TAC rise rate will be collected via the BACtrack Skyn wrist sensor, which measures transdermal alcohol concentration (TAC) in micrograms of ethanol per liter of air every 20 seconds to obtain biomarkers - rise rate is a TAC increase.
• Examine changes in Transdermal Alcohol Concentration (TAC) peak intoxication level [Baseline, 6 months]: TAC peak will be collected via the BACtrack Skyn wrist sensor, which measures transdermal alcohol concentration (TAC) in micrograms of ethanol per liter of air every 20 seconds to obtain biomarkers - peak is the maximum TAC recorded per day.
• Examine high risk drinking days [Baseline, 6 months]: Heavy episodic drinking (HED) days are recorded when women indicate drinking 4+ drinks in 2 hour window/men indicate drinking 5+ drinks in 2 hour window. High-intensity drinking (HID) days are recorded when women indicate drinking 8+ drinks in 2 hour window/men indicate drinking 10+ drinks in 2 hour window.

Secondary outcomes

• Examine negative consequences of alcohol use [Baseline, 6 months]: Alcohol related consequences (e.g., said or done embarrassing things) from the past 3 months will be measured using the established Brief Young Adult Alcohol Consequences Questionnaire. Response options will be on a 5-point scale ranging from (0) No or not in the past 3 months to (4) 4 or more times. Consequences will also be measures during the daily surveys on a Yes/No response scale.
• Examine Alcohol Use Disorder (AUD) symptoms [Baseline, 6 months]: Alcohol use disorder symptoms will be measured using the Alcohol Use Disorder Module of the SCID-5 and will be via in-person interview at baseline (past 12-months) and 6-month (past 6-months).

Sex: All, ages: 18 Years to 23 Years, accepts healthy volunteers

Inclusion Criteria:

* Between the ages of 18-23 at enrollment
* Endorse drinking 4+/5+ (women/men) on a typical Friday or Saturday in the past 3-months
* Report at least 1 alcohol-induced blackout in the past 3-months
* Willing to wear a TAC sensor for 14 days at Waves 1 and 2

Exclusion Criteria:

* Younger than 18 at baseline
* Not fluent in English
* No Internet access

• Kimberly Mallett, PhD, Principal investigator, The Pennsylvania State University