This cluster randomized trial is conducted in Beijing primary schools to evaluate the efficacy of a WeChat mini-program-based high-temperature early warning intervention on the physical and cognitive health of school-age children. Six participating schools are randomly assigned to two parallel groups. The intervention group receives tiered heat alerts and guided self-health monitoring via the mini-program. The control group follows standard daily school and family routines, with no dedicated digital high-temperature early-warning intervention. The primary outcome is children's executive function after a 2.5-month follow-up. A range of secondary indicators related to physical status, mental health and health behaviors are assessed concurrently to quantify the intervention's benefits in mitigating adverse health outcomes caused by high temperatures.
Possess adequate facilities and qualified teaching staff.
The school and teachers maintain good cooperation.
Class size is no less than 35 students.
All participating classrooms are equipped with air conditioners.
Participants who are unable or refuse to complete required examinations.
Students receiving psychological or psychiatric treatment that may confound the study results.
Those currently enrolled in other interventional clinical studies that may affect outcome assessment.
Any other conditions deemed ineligible by the research team. Any participant meeting any of the above exclusion criteria will be excluded from the study.