Trial Outcomes & Findings for Online Bullying Bystander Intervention for Middle Schools Phase II (NCT NCT05572398)
NCT ID: NCT05572398
Last Updated: 2026-02-24
Results Overview
An 11 item questionnaire measuring students' knowledge of buying, knowledge of the STAC-T strategies, and students' confidence to intervene in bullying situations. Items are rated on a 4-point Likert Scale ranging from 1 (Totally Disagree) to 4 (Totally Agree) and were summed to compute a total scale score. The minimum value is 11 and the maximum value is 44, and a higher score means a better outcome.
COMPLETED
NA
613 participants
Baseline assessment, 30-day assessment
2026-02-24
Participant Flow
Participant milestones
| Measure |
STAC-T
STAC-T is a brief technology-based bullying bystander intervention using four strategies: "Stealing the show," "Turning it over," "Accompanying others," and "Coaching compassion." The online curriculum is delivered to middle-school students.
STAC-T: Middle school participants will complete online modules to learn about anti-bullying techniques and bystander intervention.
|
Control
Assessment Only Control
|
|---|---|---|
|
Overall Study
STARTED
|
308
|
305
|
|
Overall Study
COMPLETED
|
249
|
258
|
|
Overall Study
NOT COMPLETED
|
59
|
47
|
Reasons for withdrawal
Withdrawal data not reported
Baseline Characteristics
Online Bullying Bystander Intervention for Middle Schools Phase II
Baseline characteristics by cohort
| Measure |
STAC-T
n=308 Participants
STAC-T is a brief technology-based bullying bystander intervention using four strategies: "Stealing the show," "Turning it over," "Accompanying others," and "Coaching compassion." The online curriculum is delivered to middle-school students.
STAC-T: Middle school participants will complete online modules to learn about anti-bullying techniques and bystander intervention.
|
Control
n=305 Participants
Assessment Only Control
|
Total
n=613 Participants
Total of all reporting groups
|
|---|---|---|---|
|
Age, Continuous
|
12.12 years
STANDARD_DEVIATION 0.94 • n=58 Participants
|
12.14 years
STANDARD_DEVIATION 1.03
|
12.13 years
STANDARD_DEVIATION 0.98 • n=1 Participants
|
|
Sex/Gender, Customized
Gender · Male
|
124 Participants
n=58 Participants
|
118 Participants
|
242 Participants
n=1 Participants
|
|
Sex/Gender, Customized
Gender · Female
|
167 Participants
n=58 Participants
|
172 Participants
|
339 Participants
n=1 Participants
|
|
Sex/Gender, Customized
Gender · Missing
|
17 Participants
n=58 Participants
|
15 Participants
|
32 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
White
|
133 Participants
n=58 Participants
|
152 Participants
|
285 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
Hispanic
|
70 Participants
n=58 Participants
|
73 Participants
|
143 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
African-American
|
59 Participants
n=58 Participants
|
41 Participants
|
100 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
Asian
|
5 Participants
n=58 Participants
|
1 Participants
|
6 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
American Indian/Alaska Native
|
4 Participants
n=58 Participants
|
4 Participants
|
8 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
Native Hawaiian/Pacific Islander
|
1 Participants
n=58 Participants
|
1 Participants
|
2 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
More than One Race
|
26 Participants
n=58 Participants
|
22 Participants
|
48 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
Other
|
4 Participants
n=58 Participants
|
2 Participants
|
6 Participants
n=1 Participants
|
|
Race/Ethnicity, Customized
Missing
|
6 Participants
n=58 Participants
|
9 Participants
|
15 Participants
n=1 Participants
|
|
Grade
Sixth
|
113 Participants
n=58 Participants
|
130 Participants
|
243 Participants
n=1 Participants
|
|
Grade
Seventh
|
132 Participants
n=58 Participants
|
93 Participants
|
225 Participants
n=1 Participants
|
|
Grade
Eighth
|
63 Participants
n=58 Participants
|
82 Participants
|
145 Participants
n=1 Participants
|
PRIMARY outcome
Timeframe: Baseline assessment, 30-day assessmentAn 11 item questionnaire measuring students' knowledge of buying, knowledge of the STAC-T strategies, and students' confidence to intervene in bullying situations. Items are rated on a 4-point Likert Scale ranging from 1 (Totally Disagree) to 4 (Totally Agree) and were summed to compute a total scale score. The minimum value is 11 and the maximum value is 44, and a higher score means a better outcome.
Outcome measures
| Measure |
STAC-T
n=249 Participants
STAC-T is a brief technology-based bullying bystander intervention using four strategies: "Stealing the show," "Turning it over," "Accompanying others," and "Coaching compassion." The online curriculum is delivered to middle-school students.
STAC-T: Middle school participants will complete online modules to learn about anti-bullying techniques and bystander intervention.
|
Control
n=258 Participants
Assessment Only Control
|
|---|---|---|
|
Student-Advocates Pre- and Post-Scale (SAPPS)
Baseline
|
29.29 score on a scale
Standard Deviation 4.39
|
29.70 score on a scale
Standard Deviation 4.53
|
|
Student-Advocates Pre- and Post-Scale (SAPPS)
30-Day
|
34.19 score on a scale
Standard Deviation 6.32
|
32.12 score on a scale
Standard Deviation 5.64
|
PRIMARY outcome
Timeframe: Baseline assessment, 30-day assessmentThis questionnaire measures bullying and cyberbullying victimization in the past 30 days. The 13-item Victimization Scale assesses in-person bullying victimization with 8 items and cyberbullying victimization with 5 items. Items are rated on a 5-point Likert Scale ranging from 0 (Never) to 4 (Four or More Times) and were summed to compute a total scale score. The minimum value is 0 and the maximum value is 52, and a higher score means a worse outcome.
Outcome measures
| Measure |
STAC-T
n=249 Participants
STAC-T is a brief technology-based bullying bystander intervention using four strategies: "Stealing the show," "Turning it over," "Accompanying others," and "Coaching compassion." The online curriculum is delivered to middle-school students.
STAC-T: Middle school participants will complete online modules to learn about anti-bullying techniques and bystander intervention.
|
Control
n=258 Participants
Assessment Only Control
|
|---|---|---|
|
Bullying and Cyberbullying Scale for Adolescents (BCS-A) - Victimization Scale at 30 Days
Baseline
|
8.52 score on a scale
Standard Deviation 10.56
|
8.30 score on a scale
Standard Deviation 10.6
|
|
Bullying and Cyberbullying Scale for Adolescents (BCS-A) - Victimization Scale at 30 Days
30-Day
|
7.81 score on a scale
Standard Deviation 10.61
|
8.66 score on a scale
Standard Deviation 10.71
|
PRIMARY outcome
Timeframe: 30-day assessmentQuestions rating the student's use of each STAC-T strategy using a single item rated on a 5-point Likert scale: "How often would you say you have used these strategies to stop bullying in the past month?" (a) Stealing the Show; (b) Turning it Over; (c) Accompanying Others; and (d) Coaching Compassion. Total strategies reflects the number of students who used at least one of the four STAC-T strategies. Results are reported for students who reported witnessing bullying in the past 30-days (n=125/229).
Outcome measures
| Measure |
STAC-T
n=125 Participants
STAC-T is a brief technology-based bullying bystander intervention using four strategies: "Stealing the show," "Turning it over," "Accompanying others," and "Coaching compassion." The online curriculum is delivered to middle-school students.
STAC-T: Middle school participants will complete online modules to learn about anti-bullying techniques and bystander intervention.
|
Control
Assessment Only Control
|
|---|---|---|
|
Use of Strategies at 30 Days Post-intervention
Stealing the Show · Used Strategy
|
73 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Stealing the Show · Did Not Use Strategy
|
52 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Turning it Over · Used Strategy
|
86 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Turning it Over · Did Not Use Strategy
|
39 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Accompanying Others · Used Strategy
|
97 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Accompanying Others · Did Not Use Strategy
|
28 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Coaching Compassion · Used Strategy
|
73 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Coaching Compassion · Did Not Use Strategy
|
52 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Total Strategies · Used Strategy
|
111 Participants
|
—
|
|
Use of Strategies at 30 Days Post-intervention
Total Strategies · Did Not Use Strategy
|
14 Participants
|
—
|
Adverse Events
STAC-T
Control
Serious adverse events
Adverse event data not reported
Other adverse events
Adverse event data not reported
Additional Information
Results disclosure agreements
- Principal investigator is a sponsor employee
- Publication restrictions are in place