BullyDown, a Text Messaging-based Bullying Prevention Program for Middle School-aged Youth

December 2, 2025 updated by: Center for Innovative Public Health Research

Developing a Bullying Prevention Program That Transcends Physical Boundaries

Given the limited impact of existing school-based interventions and the time associated with implementing them during school time, more efficient and effective intervention methods are needed. Programs that can be delivered to middle school youth irrespective of whether they are attending school physically or virtually may be especially relevant as school boundaries become more fluid. BullyDown addresses this critical need by providing a scalable program that could be quickly and cost-effectively disseminated nationally.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
138

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • San Clemente, California, United States, 92672-6745
        • Center for Innovative Public Health Research
    • North Carolina
      • Chapel Hill, North Carolina, United States, 27599-2100
        • University of North Carolina at Chapel Hill

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child

Accepts Healthy Volunteers

Yes

Description

Participants will: be enrolled in one of our partner schools, be in middle school (i.e., 7th or 8th grade) or between the ages of 12-14 years of age, be English-speaking, own their own cell phone, intend to have the same cell phone number for at least 3 months (this may or may not apply, depending on the number of youth who meet this criterion), and provide informed written assent. Non-English speakers and youth who do not have the reading ability to complete the screener are not eligible. Youth recruited from schools will also be required to have parental permission.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: BullyDown intervention
Behavioral: BullyDown
BullyDown is an 8 week, text messaging-based prevention program aimed to prevent bullying behaviors among middle school-aged youth. Message content is based upon the social-emotional learning model.
Placebo Comparator: Healthy lifestyle control
Behavioral: Attention-matched control
The attention-matched control will receive the messages for the same number of days as the intervention. Content will talk about 'healthy lifestyle' topics, such as fitness and healthy social media use.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Feasibility: Recruitment Rate
Time Frame: Recruitment period
If at least 75% of eligible participants assent to participate, this will be supportive of a hypothesis of feasibility. Note that a youth could assent and not be randomized if they did not complete the baseline survey.
Recruitment period
Acceptability of the Intervention
Time Frame: Intervention end, 9 weeks after program enrollment
Youth were asked: "How likely are you to recommend BullyDown to other people your age?" Answers were collected on a 5-point Likert scale. The response option ranged from 1-5, with higher values reflecting greater acceptability. An average score of 4 or higher was deemed supportive of program acceptability.
Intervention end, 9 weeks after program enrollment
Feasibility: Retention at 3-month Follow-up
Time Frame: 21 weeks post-randomization, 3 months after the 9-week program ended
A retention rate of 80% or higher was deemed to be supportive of a hypothesis of feasibility
21 weeks post-randomization, 3 months after the 9-week program ended

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Feasibility: Retention Rate at Program End
Time Frame: 9 weeks post-randomization
A retention rate of 80% or higher was deemed supportive of a hypothesis of feasibility.
9 weeks post-randomization

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Rates of Bullying Perpetration in the Intervention Versus Control Group
Time Frame: Reported bullying perpetration behavior in the past 30 days at the end of the 9 week program
Bullying behaviors towards other youth the same age 3 or more times in the past 30 days
Reported bullying perpetration behavior in the past 30 days at the end of the 9 week program
Rates of Aggressive Behavior in the Intervention Versus Control Group
Time Frame: Reported aggressive behavior in the past 30 days at the end of the 9 week program
Youth who report aggressive acts towards others 1-2 times in the past 30 days
Reported aggressive behavior in the past 30 days at the end of the 9 week program
Scores of Bystanding Behavior in the Intervention Versus Control Group
Time Frame: Responses provided at the program end survey, 9 weeks after they were randomized
Bystander intentions are measured using the 5-item University of Illinois Willingness to Intervene scale. Each of the items is measured on a 4-point Likert scale, resulting in a sum that ranges from 5 - 20. A higher score reflects a greater willingness to intervene.
Responses provided at the program end survey, 9 weeks after they were randomized

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Center for Innovative Public Health Research

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
University of North Carolina, Chapel Hill

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
August 15, 2023

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 3, 2024

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
June 3, 2024

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
August 16, 2023

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 25, 2023

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
August 30, 2023

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
December 5, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 2, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
July 1, 2025

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • R21HD104369 (U.S. NIH Grant/Contract)

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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