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| ID | Type | Description | Link |
|---|---|---|---|
| R34AA027689 | U.S. NIH Grant/Contract | View source |
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| Name | Class |
|---|---|
| National Institute on Alcohol Abuse and Alcoholism (NIAAA) | NIH |
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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.
Alcohol and marijuana (AM) are the most commonly used substances among adolescents in the U.S. The consequences of AM use are significantly higher relative to use of either substance alone. This study builds on effective interventions that have demonstrated reductions in alcohol and/or marijuana use and reduced consequences one year later, and proposes to adapt one of those interventions, CHAT, to the web (web-CHAT). The investigators will evaluate the efficacy of web-CHAT among 15.5-17-year-old adolescents (n=150) recruited when teen participants are attending behind-the-wheel training. The study has the potential to promote public welfare by improving adolescent health outcomes and reducing risky driving behaviors that can have substantial monetary and social costs, as well as by providing unique insight into what mediates reduced risky driving attitudes behaviors among those in the intervention. The study is innovative because it is for both youth who are at risk for substance use as well as those who are not, and it is delivered during a teachable moment when adolescents receive driver's education. Finally, this study can provide unique insights about the efficacy of web-CHAT to reduce marijuana initiation, use, and risky driving attitudes in the context of a changing marijuana policy climate. A 3-year study is proposed to test the feasibility of research procedures in a driver education setting and pilot the efficacy of web-CHAT. The investigators will test whether web-CHAT reduces alcohol and/or marijuana initiation or use compared to teens in UC, at three and six-month follow-up.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 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. |
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| Usual Care | Active Comparator | Existing driving school education |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| webCHAT | Behavioral | A self-guided, single session web intervention that utilizes a motivational interviewing style to prevent impaired driving |
|
| Measure | Description | Time Frame |
|---|---|---|
| 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 |
| Measure | Description | Time Frame |
|---|---|---|
| Driving Under the Influence | Number and percentage of participants who drove under the influence of alcohol and/or cannabis in the past 90 days | Assessed at 6 month follow-up |
| Riding With Impaired Driver |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Karen Osilla, PhD | Professor | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| DriveSafe Driving School | Denver | Colorado | 80220 | United States | ||
| DriveSafe Driving School |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 39558402 | Background | 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. | |
| 41850531 | Derived | Osilla KC, Nameth K, Rodriguez A, Hummer JF, 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 Jul;186:209945. doi: 10.1016/j.josat.2026.209945. Epub 2026 Mar 17. |
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| ID | Title | Description |
|---|---|---|
| FG000 | webCHAT | 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. |
| FG001 | Usual Care | Existing driving school education |
| Title | Milestones | Reasons Not Completed | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
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| ID | Title | Description |
|---|---|---|
| BG000 | webCHAT | 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. |
| BG001 | Usual Care |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Categorical | Age at enrollment |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | 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) | Posted | Count of Participants | Participants | Baseline through 6-month-follow-up |
|
From baseline until the end of follow-up, up to 6 months
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | webCHAT | 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. |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Dr. Karen Osilla (PI) | Stanford University School of Medicine | (650) 721-7091 | kosilla@stanford.edu |
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot | Yes | No | No | Study Protocol | Aug 4, 2023 | Dec 12, 2025 | Prot_000.pdf |
| SAP | No | Yes | No | Statistical Analysis Plan | Jul 15, 2025 | Dec 12, 2025 | SAP_001.pdf |
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| ID | Term |
|---|---|
| D019966 | Substance-Related Disorders |
| ID | Term |
|---|---|
| D064419 | Chemically-Induced Disorders |
| D001523 | Mental Disorders |
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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.
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| Usual Care | Behavioral | 6 hours of driver education |
|
Total number of participants who self-reported an increased frequency of riding with an impaired driver (RWID) who had consumed the specified substance or combination of substances in the past 3 months at 3- and/or 6-month-follow-up when compared to baseline as indicated by a binary (1 = increased frequency; 0 = maintained or reduced frequency)
| Baseline through month 6 |
| Perceived Descriptive Norms | Percentage of their peers (0% of their peers-100% of their peers) participants believe have consumed alcohol, cannabis, or both simultaneously in past month | 6 month follow-up |
| Dearborn |
| Michigan |
| 48126 |
| United States |
| 36964608 | Derived | 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. |
Existing driving school education
| BG002 | Total | Total of all reporting groups |
| Participants |
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| Sex/Gender, Customized | Self-reported gender identity | Count of Participants | Participants |
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| Race (NIH/OMB) | Count of Participants | Participants | No |
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| Ethnicity (NIH/OMB) | Count of Participants | Participants | No |
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| CRAFFT Screener | Validated instrument consisting of 6 yes/no questions used to evaluate risk of developing a substance use disorder in adolescents. Each yes response counts as 1 point. A score of (2) or more indicates the need for further assessment. | Count of Participants | Participants | No |
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| Lifetime Substance Use | Total number of participants who self-reported EVER using that substance or substance combination across their entire lifetime | Count of Participants | Participants |
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| Lifetime History of Riding with Impaired Driver | Self-reported history of riding with a driver who is under the influence across lifetime | Count of Participants | Participants |
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| Secondary | Driving Under the Influence | Number and percentage of participants who drove under the influence of alcohol and/or cannabis in the past 90 days | Posted | Count of Participants | Participants | Assessed at 6 month follow-up |
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|
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| Secondary | Riding With Impaired Driver | Total number of participants who self-reported an increased frequency of riding with an impaired driver (RWID) who had consumed the specified substance or combination of substances in the past 3 months at 3- and/or 6-month-follow-up when compared to baseline as indicated by a binary (1 = increased frequency; 0 = maintained or reduced frequency) | Posted | Count of Participants | Participants | Baseline through month 6 |
|
|
|
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| Secondary | Perceived Descriptive Norms | Percentage of their peers (0% of their peers-100% of their peers) participants believe have consumed alcohol, cannabis, or both simultaneously in past month | Posted | Mean | Standard Deviation | Percent of Peers | 6 month follow-up |
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| 0 |
| 106 |
| 0 |
| 106 |
| 0 |
| 106 |
| EG001 | Usual Care | Existing driving school education | 0 | 92 | 0 | 92 | 0 | 92 |
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| RWID-Simultaneous |
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| Consume Simultaneously |
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