Cities for Better Health: Preventing Childhood Obesity in Chiba City, Japan

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This interventional study will implement a multi-level package across elementary schools and surrounding environments in 22 clusters within Chiba City, aiming to promote healthier eating, increased physical activity, and better well-being. The primary outcomes are changes in BMI z-score and KIDSCREEN-10 quality of life scores after one and two years. Schools are assigned to receive the intervention or serve as controls, with baseline and follow-up assessments to compare outcomes. Data will be collected from participating children and their families, focusing on environment, behavior, and health indicators. The initiative involves school activities, parks, an ambassador program, and home-based components to sustain lifestyle changes.

Why it matters

Who can join: the full rules

Inclusion Criteria:

* Children aged 6 to 12 years who are currently enrolled in one of the public elementary schools located within the 22 participating Junior High School District clusters in Chiba City.
* The parent or legal guardian of each child must provide written informed consent prior to participation.
* Parents or legal guardians must have sufficient Japanese language proficiency to understand study procedures, complete questionnaires, and provide accurate information during the study.
* Children must be physically and cognitively capable of participating in school- and community-based activities involved in the intervention.
* Participants must not have any medical conditions that would preclude safe participation in routine physical activities promoted by the intervention.

Exclusion Criteria:

* Children whose parents or legal guardians fail to provide complete informed consent.
* Families who withdraw consent at any point during the study period.
* Children who independently express refusal to participate, even with parental consent.
* Children with serious physical, psychological, or developmental disorders that prevent them from participating safely in the program's activities.
* Families planning to relocate outside of Chiba City during the study period, making follow-up assessment infeasible.

Where it's running

• Chiba University
  Chiba, Chiba, Japan Recruiting

Study contacts

• Study coordinator: Atsushi Nakagomi, MD, PhD
• Email: anakagomi0211@chiba-u.jp
• Phone: +81-43-290-3177

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.