在香港老年人中开发并测试减少孤独感的正念干预的有效性：混合序列递进随机试验和微随机试验实验设计研究方案

Abstract Background Loneliness is a growing public health concern among older adults, likewise in Hong Kong. Mindfulness-based interventions have shown promise in addressing loneliness, but often yield modest and short-lived effects. Digital delivery makes such interventions scalable but sustaining user engagement remains challenging. Adaptive interventions that integrate human support, mobile technology, and machine learning show promise, yet rigorous evidence remains limited. This study aims to develop and evaluate a machine learning-enabled mindfulness intervention to reduce loneliness and