TTM-Based Intervention for Weight Management Among High School Female Students (TTM-WMHSFS-RCT)

Efficacy of the Transtheoretical Model of Change-Based Intervention on Weight Management Behavior Among High School Female Students: A Randomized Controlled Trial

To examine the efficacy of a Transtheoretical Model (TTM)-based intervention in improving weight management behaviors.

1. To identify if the student age, body mass index (BMI) and socioeconomic status can predict WMB.
2. To investigate the difference in students' WMB between groups of grade, liven arrangement, socioeconomic class, and BMI.

Study Overview

• Status: Not yet recruiting
• Conditions: Weight Management
• Intervention / Treatment: Behavioral: Transtheoretical Model (TTM)-Based Behavioral Intervention for Weight Management

Detailed Description

This randomized controlled trial aims to evaluate the efficacy of a Transtheoretical Model (TTM)-based behavioral intervention in improving weight management behaviors among high school female students. The intervention is designed to guide participants through the stages of behavior change, enhancing their readiness to adopt and maintain healthy lifestyle practices such as balanced nutrition, physical activity, and weight control behaviors. The study will compare outcomes between an intervention group receiving structured TTM-based sessions and a control group receiving standard health education. Primary outcomes will focus on changes in weight management behaviors, while secondary outcomes may include changes in stage of readiness for change, self-efficacy, and health-related attitudes. The findings are expected to provide evidence on the effectiveness of stage-based behavioral interventions in promoting healthy weight management among adolescent females.

• Study Type: Interventional
• Enrollment (Estimated): 154
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Doaa Kadhim Sabbar Sabbar, PhD; Phone Number: +9467804600745; Email: doaa.kazem1206a@conursing.uobaghdad.edu.iq

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child; Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Female high school students
• Age 15-19 years
• Overweight or obese according to Body Mass Index (BMI) criteria
• Enrolled in high school morning classes
• Willing to participate in the study and provide informed consent

Exclusion Criteria:

• Students below high school level (e.g., middle school students)
• Students with physical disabilities that prevent participation in physical activity
• Students with chronic medical conditions affecting body weight or study participation

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Experimental (Intervention Group); Participants in this arm will receive a structured behavioral intervention based on the Transtheoretical Model of behavior change. The program includes stage-matched educational and counseling sessions designed to improve weight management behaviors. Components include guidance on healthy eating, promotion of physical activity, goal setting, self-monitoring, and motivation enhancement according to each participant's readiness for change. The intervention is non-pharmacological and has no known side effects.	Behavioral: Transtheoretical Model (TTM)-Based Behavioral Intervention for Weight Management; This is a non-pharmacological, behavioral intervention designed to improve weight management behaviors among high school female students. It is based on the Transtheoretical Model of behavior change and consists of structured, stage-matched educational and counseling sessions. The intervention includes guidance on healthy dietary practices, promotion of regular physical activity, goal setting, self-monitoring techniques, and motivational strategies tailored to each participant's readiness to change.
No Intervention: Control (No Intervention); Participants in this arm will receive routine school-based health education only. This includes general information about healthy lifestyle practices such as balanced nutrition and physical activity. No structured behavioral change program or stage-based intervention will be provided.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in Weight Management Behavior Scores Measured by TTM-Based Questionnaires	Change in Weight Management Behavior Scores Measured by TTM-Based Questionnaires: Weight Control Decisional Balance Scale (WCDBS): 20-item scale with scores ranging from -40 to +40. Higher positive scores indicate more favorable attitudes toward healthy weight management behaviors. Weight Control Processes of Change Scale (WCPOCS): 48-item scale with scores ranging from 48 to 240. Higher scores indicate greater engagement in healthy weight management behavior change processes. Stages of Change for Weight Control Scale (SCWCS): categorizes participants into precontemplation, contemplation, preparation, action, and maintenance stages. Higher stages indicate greater readiness for healthy weight management behavior change. The outcome will be reported as mean score changes and stage distribution differences between intervention and control groups.	6 months

Collaborators and Investigators

• Sponsor: University of Baghdad

Study record dates

Study Major Dates

• Study Start (Estimated): October 10, 2026
• Primary Completion (Estimated): March 10, 2027
• Study Completion (Estimated): April 10, 2027

Study Registration Dates

• First Submitted: May 12, 2026
• First Submitted That Met QC Criteria: May 19, 2026
• First Posted (Actual): May 22, 2026

Study Record Updates

• Last Update Posted (Actual): May 22, 2026
• Last Update Submitted That Met QC Criteria: May 19, 2026
• Last Verified: May 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Investigative Techniques; Models, Theoretical; Models, Psychological; Health Belief Model; Transtheoretical Model
• Other Study ID Numbers: Weight Management

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No