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Peer Influences in Alcohol and Sexual Violence Among Marines Dyads

NCT ID: NCT07256275

Last Updated: 2025-12-18

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

NOT_YET_RECRUITING

Total Enrollment

320 participants

Study Classification

OBSERVATIONAL

Study Start Date

2026-01-15

Study Completion Date

2030-08-31

Brief Summary

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The goal of this experimental study is to examine the complex and multifaceted influence of peers on alcohol-involved sexual violence perpetration (ASVP) in U.S. Marine Corps (USMC) men. The specific aims are:

Aim 1: Use ecological momentary assessment (EMA) to examine event-level effects of one's own alcohol use, peer alcohol use, and injunctive norms on ASVP intentions among dyads of Marine men who drink together (n=160 dyads; 320 total participants).

Aim 2: Examine the individual and peer effects on ASVP behavior in an experimental paradigm with a gender x confederate (potential victim) intoxication status design. In-the-moment dyad-peer verbalized encouragement for ASVP ("go cues") will be assessed by qualitatively coding verbalizations during the interaction.

Aim 3: Examine modifiable risk factors on ASVP intentions in vivo (Aim 1; EMA) and ASVP behavior in vitro (Aim 2; experiment) settings.

Participants will complete: 1) an individual orientation session with informed consent, baseline assessment, and EMA demo; 2) 14 days of EMA completed individually; and 3) a dyadic session to complete an experimental paradigm via videoconferencing. All study procedures will be completed in off-duty time as to not interfere with military duties.

Detailed Description

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The overarching goal of this R01 is to obtain an event-level understanding of the role of alcohol and peer interpersonal behavior in sexual violence perpetration among Marine men. Rates of heavy episodic drinking and military sexual assault are high in the military, and highest among Marines. Alcohol is involved in 21-80% of sexual violence incidents among servicewomen and 14-56% of incidents among servicemen. Perceived peer norms and interpersonal interactions are key predictors of alcohol use and alcohol-involved sexual violence perpetration (ASVP) among civilians; however, it is unclear if these risk factors operate similarly in military populations. Peers in the US Marine Corps are unique and exert powerful influence on adaptive behaviors and attitudes and more negative health behaviors such as alcohol misuse. The proposed multi-method project, implemented by an experienced team of investigators, will simultaneously address several major and persistent gaps in knowledge. First, the investigators will obtain an event-level understanding of the effects of one's own and peer alcohol use, and the role of alcohol in ASVP norms on ASVP intentions in the US Marine Corps by integrating findings from in vivo and in vitro assessment methods. Second, this study will examine and assess the individual and peer effects of in-the-moment encouragement and discouragement on ASVP behaviors in an experimental paradigm. The investigators will accomplish this by leveraging innovative dyadic approaches employed among civilian dyads, thereby elucidating peer influences on ASVP among men in the US Marine Corps. The proposed study will recruit pairs of enlisted men currently serving in the US Marine Corps who engaged in heavy episodic drinking at least twice together in the past month. Dyads will complete ecological momentary assessments about their own and perceived peer alcohol use and ASVP intentions twice daily for 14 days. The study will also compare modifiable risk effects of peer influence acceptance of ASVP intentions and behaviors in vivo and in vitro settings.

Conditions

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Peer Influence Alcohol-Involved Sexual Violence Perpetration

Keywords

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Alcohol-Involved Sexual Violence Perpetration Ecological Momentary Assessment Sexual Imposition Task Peer Influence

Study Design

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Observational Model Type

CASE_ONLY

Study Time Perspective

OTHER

Study Groups

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Confederate Group: Intoxicated Man

Participants in this group are randomly assigned to complete the experiment with a confederate who is an intoxicated man.

No interventions assigned to this group

Confederate Group: Sober Man

Participants in this group are randomly assigned to complete the experiment with a confederate who is a sober man.

No interventions assigned to this group

Confederate Group: Intoxicated Woman

Participants in this group are randomly assigned to complete the experiment with a confederate who is an intoxicated woman.

No interventions assigned to this group

Confederate Group: Sober Woman

Participants in this group are randomly assigned to complete the experiment with a confederate who is a sober woman.

No interventions assigned to this group

Eligibility Criteria

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Inclusion Criteria

* Men
* Aged 21 or older
* Currently serving in the United States Marine Corps (USMC)
* Marine dyads must have engaged in heavy episodic drinking (≥5 drinks in less than two hours) together at least twice in the past month
* Marine dyads must rate their peer at a minimum of "somewhat important" on the Important People Interview.
Minimum Eligible Age

21 Years

Eligible Sex

MALE

Accepts Healthy Volunteers

No

Sponsors

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Medical University of South Carolina

OTHER

Sponsor Role collaborator

University of Colorado Health

OTHER

Sponsor Role collaborator

University of Washington

OTHER

Sponsor Role collaborator

Georgia State University

OTHER

Sponsor Role lead

Responsible Party

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Amanda Gilmore

Associate Professor

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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Amanda K Gilmore, PhD

Role: PRINCIPAL_INVESTIGATOR

Georgia State University

Locations

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Georgia State University

Atlanta, Georgia, United States

Site Status

Countries

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United States

Central Contacts

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Amanda K Gilmore, PhD

Role: CONTACT

Phone: (404) 413-2000

Email: [email protected]

Facility Contacts

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Amanda K Gilmore, PhD

Role: primary

Provided Documents

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Document Type: Informed Consent Form

View Document

Other Identifiers

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H25332

Identifier Type: -

Identifier Source: org_study_id