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IRCT20230112057116N5 IRCT 2026-06-30 Shahid Beheshti University of Medical Sciences The Effect of Web‑Based Education on weight Loss in Adolescents" Investigating the Effect of Web‑Based Education on Weight Loss in Overweight and Obese Adolescents Using Planned Behavior Theory 2026-08-23 anticipated 182 Pending https://irct.ir/trial/91183 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Randomization description: This study is an open-label randomized controlled trial; therefore, participants and researchers will be aware of the assigned intervention type. However, to maintain allocation concealment, a stratified block randomization method with Sequentially Numbered, Opaque, Sealed Envelopes (SNOSE) will be used. The study strata include four subgroups: 1) obese girls, 2) overweight girls, 3) obese boys, and 4) overweight boys. Within each stratum, participants will be allocated to intervention groups A and B in a 1:1 ratio. The block size is fixed at 4, such that in each block, 2 participants are assigned to one group and 2 to the other group. Random sequences will be generated separately for each stratum using SAS software version 9.4. These sequences will then be recorded on cards, and each card will be placed inside an opaque envelope. The envelopes will be prepared in advance, completely opaque, sealed, and non-transparent from the outside, with only the sequence number written on the outer surface. After placing the card inside, the envelope flaps will be glued and sealed to prevent any view of the contents. The envelopes will be kept in a box based on sequential numbering. Upon enrollment of each eligible participant, the envelope corresponding to the order of entry will be opened, and the allocated group will be revealed. In this way, prediction or manipulation of the allocation process will not be possible. N/A Obesity. Intervention 1: Intervention group: Receives 6 sessions of 20‑minute web‑based education (pre‑recorded videos by the researcher) with the following titles:Introduction and positive attitude toward weight lossSubjective norms and social supportPerceived behavioral control and goal settingHealthy nutrition and meal managementPhysical activity and craving managementSelf‑monitoring, feedback, and sustained motivation. Intervention 2: Control group: Receives routine education provided by healthcare providers at comprehensive health centers. No - There is not a plan to make this available Justification or reason for not sharing IPD is Individual participant data will not be shared publicly to protect confidentiality and ethical standards.
public Peigham Heidarpoor
7th Floor, Daneshjoo Blvd, Velenjak,
Tehran Iran (Islamic Republic of) 1985747443 +98 21 23871 pheidarpoormd@gmail.com Shahid Beheshti University of Medical Sciences scientific Peigham Heidarpoor
Toraj Alley, Valiasr Street
Tehran Iran (Islamic Republic of) 1985747443 +98 21 2621 0092 pheidarpoormd@gmail.com Shahid Beheshti University of Medical Sciences Iran (Islamic Republic of) People who have access to the internet and mobile phones." "Overweight and obese Adolescents 13 years 18 years Both Adolescents with normal weight Lifestyle Lifestyle Intervention group: Receives 6 sessions of 20‑minute web‑based education (pre‑recorded videos by the researcher) with the following titles:Introduction and positive attitude toward weight lossSubjective norms and social supportPerceived behavioral control and goal settingHealthy nutrition and meal managementPhysical activity and craving managementSelf‑monitoring, feedback, and sustained motivation Control group: Receives routine education provided by healthcare providers at comprehensive health centers. Mean change in Body Mass Index (BMI). Timepoint: Before and three months after the educational intervention. Method of measurement: Weight (calibrated scale, 0.1 kg precision) and height (stadiometer, 0.1 cm precision) are measured by a single trained assessor. BMI is calculated as weight (kg) divided by height squared (m²). Measurements are taken at baseline and 3 months post-intervention. Mean change in knowledge. Timepoint: Before and three months after the intervention. Method of measurement: Mazloumi & Navabi questionnaire (based on the Theory of Planned Behavior. Mean change in attitude. Timepoint: Before and three months after the intervention. Method of measurement: Mazloumi & Navabi questionnaire (based on the Theory of Planned Behavior. Mean change in subjective norms. Timepoint: Before and three months after the intervention. Method of measurement: Mazloumi & Navabi questionnaire (based on the Theory of Planned Behavior. Mean change in perceived behavioral control. Timepoint: Before and three months after the intervention. Method of measurement: Mazloumi & Navabi questionnaire (based on the Theory of Planned Behavior. Mean change in behavioral intention. Timepoint: Before and three months after the intervention. Method of measurement: Mazloumi & Navabi questionnaire (based on the Theory of Planned Behavior. Mean change in behavior (performance). Timepoint: Before and three months after the intervention. Method of measurement: Mazloumi & Navabi questionnaire (based on the Theory of Planned Behavior. Shahid Beheshti University of Medical Sciences Approved 2026-04-22 Ethics Committee of Shahid Beheshti University of Medical Sciences Toraj Alley, Valiasr Street, Tehran Tehran Iran (Islamic Republic of)