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| ID | Type | Description | Link |
|---|---|---|---|
| 1R01AA029112-01 | 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 purpose of this research study is to understand people's alcohol use in public places and their risks for harm. The overall goal of this study is to test the effects of subsidized ridesharing as an intervention to reduce self-reported alcohol-impaired driving, along with alcohol consumption and changes to mobility.
Motor vehicle crashes are the leading cause of death for people aged 13-25 years in the US, and approximately 31% of all fatal crashes involved some alcohol use. Several peer-reviewed studies have found that ridesharing was associated with fewer alcohol-involved crashes and DUI arrests. Theories of behavioral economics provide a clear theoretical mechanism by which ridesharing will reduce alcohol-involved motor vehicle crashes compared to other private transportation. However, while ridesharing may be an effective intervention to reduce alcohol-involved crashes, it may simultaneously increase alcohol consumption. This study will assess the impacts of subsidized ridesharing on impaired driving, alcohol consumption, and mobility. Participants will be randomized to either receive a rideshare voucher or an online shopping voucher, and effects on alcohol impaired driving and alcohol consumption will be measured. A GPS sub-group will use a custom smartphone application for GPS tracking to measure mobility.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Intervention | Experimental | Participants will be asked to complete 3 surveys over 2 weeks to collect in information on their alcohol use and about themselves, and receive ridesharing vouchers. |
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| Control | Sham Comparator | Participants will be asked to complete 3 surveys over 2 weeks to collect in information on their alcohol use and about themselves, and receive online shopping voucher. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| ridesharing voucher | Behavioral | Ridesharing vouchers will be given for completing each of the online surveys, for a possible total of $80 if you complete all three surveys. You will be paid with electronic vouchers that will be sent to your cell phone. |
| Measure | Description | Time Frame |
|---|---|---|
| Number of Participants Involved in Alcohol Impaired Driving Incidents | Participants will provide two self-reported measures of impaired driving by indicating whether they "drove after drinking any alcohol" (driving after drinking) and "drove after drinking too much alcohol to drive safely" (driving while intoxicated) for each day during the previous 7 days. Data is recorded at baseline and at 1 week follow-up. | At 1 week follow-up from baseline |
| Measure | Description | Time Frame |
|---|---|---|
| Change in Number of Days in Alcohol Consumption | Participants will be asked to state the number of drinks consumed on each day for the 7 previous days, and their responses will be used to calculate the frequency (defined as the number of drinking days) of drinking. | Baseline, 1 week follow-up |
| Average Number of Trips to Alcohol Outlets |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Christopher Morrison, PhD | Columbia University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Columbia University Irving Medical Center | New York | New York | 10032 | United States |
Data from the study will be submitted and shared with NIAAA Data Archive (NIAAADA), a data repository housed within the NIMH Data Archive (NDA).
Data will become available March 2028, 2 years after the end of the project, as designated by NIAAADA policy.
Study data can be accessed on the NIAAADA website: https://nda.nih.gov/niaaa/getting-data For access to individual-level data, researchers will need to receive authorization from NIAAA by completing the NDA Data Access Request (DAR).
Participants enrolled but lost to follow-up before the pre-intervention survey were not assigned to a study arm. 5856 out of 7034 were randomized to a study arm.
Participants were recruited via social media advertisements in eligible, randomly selected cities across the United States. While the cities were selected based on shared criteria, the study design is a two-arm, parallel-group randomized controlled trial where the individual is the unit of randomization, and it is not a cluster-randomized trial. To increase the likelihood of balance within cities, we utilized stratified randomization, using the city of residence as the stratification factor.
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| ID | Title | Description |
|---|---|---|
| FG000 | Intervention | Participants will be asked to complete 3 surveys (enrollment survey, pre-intervention survey, and post-intervention survey) over 2 weeks to collect information on their alcohol use and about themselves, and receive ridesharing vouchers. |
| FG001 | Control | Participants will be asked to complete 3 surveys (enrollment survey, pre-intervention survey, and post-intervention survey) over 2 weeks to collect information on their alcohol use and about themselves, and receive an online shopping voucher. |
| Title | Milestones | Reasons Not Completed | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
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Participants enrolled but lost to follow-up before the pre-intervention (baseline) survey were not assigned to a study arm.
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| ID | Title | Description |
|---|---|---|
| BG000 | Intervention | Participants will be asked to complete 3 surveys (enrollment survey, pre-intervention survey, and post-intervention survey) over 2 weeks to collect information on their alcohol use and about themselves, and receive ridesharing vouchers. |
| BG001 | Control |
| Units | Counts |
|---|---|
| Participants |
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| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Continuous | Mean |
| 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 | Number of Participants Involved in Alcohol Impaired Driving Incidents | Participants will provide two self-reported measures of impaired driving by indicating whether they "drove after drinking any alcohol" (driving after drinking) and "drove after drinking too much alcohol to drive safely" (driving while intoxicated) for each day during the previous 7 days. Data is recorded at baseline and at 1 week follow-up. | Enrolled participants who were lost to follow-up between the pre-intervention and post-intervention surveys were not included in the outcome measure. Additionally, participants who elected not to respond to the survey question regarding this measure were not included in the outcome measure. | Posted | Count of Participants | Participants | At 1 week follow-up from baseline |
|
From enrollment until end of follow-up, up to 3 weeks
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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 | Intervention | Participants will be asked to complete 3 surveys (enrollment survey, pre-intervention survey, and post-intervention survey) over 2 weeks to collect information on their alcohol use and about themselves, and receive ridesharing vouchers. |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Christopher Morrison, MD | Columbia University | 510-501-0956 | cm3820@cumc.columbia.edu |
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | Jan 26, 2026 | Mar 5, 2026 | Prot_SAP_000.pdf |
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| ID | Term |
|---|---|
| D000066448 | Driving Under the Influence |
| D000428 | Alcohol Drinking |
| ID | Term |
|---|---|
| D000066479 | Criminal Behavior |
| D001519 | Behavior |
| D003617 | Dangerous Behavior |
| D004327 | Drinking Behavior |
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| online shopping voucher | Behavioral | Online shopping vouchers will be given for completing each of the online surveys, for a possible total of $80 if you complete all three surveys. You will be paid with electronic vouchers that will be sent to your cell phone. |
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Participants enrolled in the GPS sub-sample will be tracked and GPS records will be used to measure exposure to alcohol outlets and mobility. |
| Day 3 to Day 17 of study |
| Average Duration of Trips to Alcohol Outlets | Participants enrolled in the GPS sub-sample will be tracked and GPS records will be used measure exposure to alcohol outlets and mobility. | Day 3 to Day 17 of study |
| Change in The Drinker Inventory of Consequences Score | Select questions related to The Drinker Inventory of Consequences (DrInC), a measure of alcohol-related consequences on which higher scores reflect greater alcohol consequences. (Score range: 0-8) | Baseline, 1 week follow-up |
Participants will be asked to complete 3 surveys (enrollment survey, pre-intervention survey, and post-intervention survey) over 2 weeks to collect information on their alcohol use and about themselves, and receive an online shopping voucher. |
| BG002 | Total | Total of all reporting groups |
| years |
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| Sex/Gender, Customized | Count of Participants | Participants |
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| Race (NIH/OMB) | Count of Participants | Participants |
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| Ethnicity | Count of Participants | Participants |
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| OG001 | Control | Participants will be asked to complete 3 surveys (enrollment survey, pre-intervention survey, and post-intervention survey) over 2 weeks to collect information on their alcohol use and about themselves, and receive an online shopping voucher. |
|
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| Secondary | Change in Number of Days in Alcohol Consumption | Participants will be asked to state the number of drinks consumed on each day for the 7 previous days, and their responses will be used to calculate the frequency (defined as the number of drinking days) of drinking. | Enrolled participants who were lost to follow-up between the pre-intervention and post-intervention surveys were not included in the outcome measure. Additionally, participants who elected not to respond to the survey question regarding this measure were not included in the outcome measure. | Posted | Mean | Standard Deviation | number of drinking days | Baseline, 1 week follow-up |
|
|
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| Secondary | Average Number of Trips to Alcohol Outlets | Participants enrolled in the GPS sub-sample will be tracked and GPS records will be used to measure exposure to alcohol outlets and mobility. | Enrolled participants who were lost to follow-up were not included in the outcome measure. Additionally, participants without valid GPS data were not included in the outcome measure. Only 117 out of 2921 in the Intervention Arm and 113 out of 2935 in the Control Arm were included in the analysis. | Posted | Mean | Standard Deviation | Number of trips to alcohol outlets | Day 3 to Day 17 of study |
|
|
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| Secondary | Average Duration of Trips to Alcohol Outlets | Participants enrolled in the GPS sub-sample will be tracked and GPS records will be used measure exposure to alcohol outlets and mobility. | Enrolled participants who were lost to follow-up were not included in the outcome measure. Additionally, participants without valid GPS data were not included in the outcome measure. Only 117 out of 2921 in the Intervention Arm and 113 out of 2935 in the Control Arm were included in the analysis. | Posted | Mean | Standard Deviation | minutes | Day 3 to Day 17 of study |
|
|
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| Secondary | Change in The Drinker Inventory of Consequences Score | Select questions related to The Drinker Inventory of Consequences (DrInC), a measure of alcohol-related consequences on which higher scores reflect greater alcohol consequences. (Score range: 0-8) | Enrolled participants lost to follow-up at each timepoint are not included in the outcome measure. Additionally, participants who elected not to respond to the survey question regarding this measure were not included in the outcome measure. Only 2729 out of 2921 in the Intervention Arm and 2747 out of 2935 in the Control Arm were included in the analysis. | Posted | Mean | Standard Deviation | score on a scale | Baseline, 1 week follow-up |
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|
|
| 0 |
| 2,921 |
| 0 |
| 2,921 |
| 0 |
| 2,921 |
| EG001 | Control | Participants will be asked to complete 3 surveys (enrollment survey, pre-intervention survey, and post-intervention survey) over 2 weeks to collect information on their alcohol use and about themselves, and receive an online shopping voucher. | 0 | 2,935 | 0 | 2,935 | 0 | 2,935 |
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