Potential social-environmental factors affecting ADHD symptoms of 55,528 children from Longhua district, Shenzhen, China

Increased frequency and duration of outdoor activities during early childhood were associated with reduced ADHD symptoms in children. These findings suggest a potential association between early exposure to outdoor activities and lower levels of ADHD symptoms, particularly in densely populated urban areas where access to green spaces is limited. However, additional research is needed to explore the underlying mechanisms and long-term associations of early childhood outdoor activities with ADHD symptoms and other developmental outcomes.