Clinical Research Directory

School inclusion criteria 1. Willing to participate in the study. 2. Possess adequate facilities and qualified teaching staff. 3. The school and teachers maintain good cooperation. 4. Class size is no less than 35 students. 5. All participating classrooms are equipped with air conditioners. Participant inclusion criteria 1. Fourth-grade primary school students aged 9 to 11, of all genders. 2. Voluntary participation by students and their parents, good compliance, and signed informed consent. 3. At least one adult family member has an internet-enabled mobile device. 4. Good general health with no history of severe physical or mental disorders. 5. Local permanent residents with a residency of no less than 6 months. Participant exclusion criteria 1. Participants who are unable or refuse to complete required examinations. 2. Students receiving psychological or psychiatric treatment that may confound the study results. 3. Those currently enrolled in other interventional clinical studies that may affect outcome assessment. 4. Any other conditions deemed ineligible by the research team. Any participant meeting any of the above exclusion criteria will be excluded from the study.