NCT04959461

Brief Summary

The primary goal of this project is to evaluate the efficacy of webCHAT, a single-session web-intervention, on reducing impaired driving among adolescents receiving behind-the-wheel training at driver education programs.

Trial Health

87
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
198

participants targeted

Target at P75+ for not_applicable

Timeline
Completed

Started Jan 2022

Longer than P75 for not_applicable

Geographic Reach
1 country

2 active sites

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

First Submitted

Initial submission to the registry

June 16, 2021

Completed
27 days until next milestone

First Posted

Study publicly available on registry

July 13, 2021

Completed
6 months until next milestone

Study Start

First participant enrolled

January 1, 2022

Completed
3.2 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

March 30, 2025

Completed
5 months until next milestone

Study Completion

Last participant's last visit for all outcomes

August 31, 2025

Completed
7 months until next milestone

Results Posted

Study results publicly available

March 27, 2026

Completed
Last Updated

March 27, 2026

Status Verified

March 1, 2026

Enrollment Period

3.2 years

First QC Date

June 16, 2021

Results QC Date

December 5, 2025

Last Update Submit

March 6, 2026

Conditions

Substance-Related Disorders

Keywords

impaired driving

Outcome Measures

Primary Outcomes (1)

  • Alcohol and/or Cannabis Use

    Total number of participants who self-reported an increased frequency of using the specified substance or substance combination in the past 3 months at 3- and/or 6-month-follow-up when compared to baseline, as denoted by a binary variable (1 = increased frequency; 0 = maintained or decreased frequency)

    Baseline through 6-month-follow-up

Secondary Outcomes (3)

  • Driving Under the Influence

    Assessed at 6 month follow-up

  • Riding With Impaired Driver

    Baseline through month 6

  • Perceived Descriptive Norms

    6 month follow-up

Study Arms (2)

webCHAT

EXPERIMENTAL

Single session 20-40minute self-guided web program that discusses promotes healthy decision making around driving and discusses the risks of alcohol and cannabis-influenced driving.

Behavioral: webCHAT

Usual Care

ACTIVE COMPARATOR

Existing driving school education

Behavioral: Usual Care

Interventions

Usual CareBEHAVIORAL

6 hours of driver education

Usual Care
webCHATBEHAVIORAL

A self-guided, single session web intervention that utilizes a motivational interviewing style to prevent impaired driving

webCHAT

Eligibility Criteria

Age15 Years - 17 Years
Sexall
Healthy VolunteersYes
Age GroupsChild (0-17)

You may qualify if:

  • year olds enrolled in driver education school
  • Access to a computer or smartphone
  • Within one month of taking their driver's licensing exam

You may not qualify if:

  • Under 15.5 or over 17 years old
  • Not enrolled in one of the participating schools
  • Non-English speaking

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (2)

DriveSafe Driving School

Denver, Colorado, 80220, United States

Location

DriveSafe Driving School

Dearborn, Michigan, 48126, United States

Location

Related Publications (3)

  • Nameth K, Ueland E, D'Amico EJ, Osilla KC. Feasibility and acceptability of a web-intervention to prevent alcohol and cannabis-impaired driving among adolescents in driver education. Addict Sci Clin Pract. 2024 Nov 18;19(1):83. doi: 10.1186/s13722-024-00513-2.

    PMID: 39558402BACKGROUND

  • Osilla KC, Nameth K, Rodriguez A, Hummer J, D'Amico EJ. Preventing alcohol and cannabis-impaired driving among adolescents: Effects of a web-intervention in a driver education program. J Subst Use Addict Treat. 2026 Mar 16:209945. doi: 10.1016/j.josat.2026.209945. Online ahead of print.

    PMID: 41850531DERIVED

  • Osilla KC, D'Amico EJ, Smart R, Rodriguez A, Nameth K, Hummer J. Study design to evaluate a web-intervention to prevent alcohol and cannabis-impaired driving and use among adolescents in driver education. Addict Sci Clin Pract. 2023 Mar 24;18(1):17. doi: 10.1186/s13722-023-00373-2.

    PMID: 36964608DERIVED

MeSH Terms

Conditions

Substance-Related Disorders

Condition Hierarchy (Ancestors)

Chemically-Induced DisordersMental Disorders

Results Point of Contact

Title
Dr. Karen Osilla (PI)
Organization
Stanford University School of Medicine
kosilla@stanford.edu
(650) 721-7091

Study Officials

  • Karen Osilla, PhD

    Professor

    PRINCIPAL INVESTIGATOR

Publication Agreements

PI is Sponsor Employee
No
Restrictive Agreement
No

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
NONE
Purpose
PREVENTION
Intervention Model
PARALLEL
Model Details: Teen participants will be randomized to a single-session, self-guided web-intervention called webCHAT or usual care after completing an online baseline survey. Participants will complete follow-up surveys 3 and 6-months after baseline.
Sponsor Type
OTHER
Responsible Party
PRINCIPAL INVESTIGATOR
PI Title
Associate Professor

Study Record Dates

First Submitted

June 16, 2021

First Posted

July 13, 2021

Study Start

January 1, 2022

Primary Completion

March 30, 2025

Study Completion

August 31, 2025

Last Updated

March 27, 2026

Results First Posted

March 27, 2026

Record last verified: 2026-03

Data Sharing

IPD Sharing
Will not share

Locations

US(2)