Growing network approach analyses of posttraumatic stress disorder (PTSD) have enhanced the knowledge of PTSD symptomatology. This study aims to explore changes in network patterns of PTSD symptoms among youth survivors following the Zhouqu debris flow through a network approach. A two-year longitudinal study was conducted to follow 1460 children and adolescents at 3, 15, and 27 months after the disaster. Symptoms with high centrality varied at different time points. Sleep problems and nightmares exhibited high centrality at 3 months, and their centrality decreased over time, while the centrality of physiological cue reactivity and flashbacks increased over time and reached a high level at 27 months. The global connectivity of the network was stronger at 27 months than at 3 and 15 months. These findings provide novel insights into youths’ PTSD symptom evolution. Temporal differences in PTSD symptoms merit more attention from researchers. Different core symptoms in acute and chronic PTSD structures should be treated as targets at different stages following trauma in clinical practice.

创伤后应激障碍（PTSD）的日益增长的网络方法分析增强了PTSD症状学的知识。本研究旨在探讨通过网络方法在舟曲泥石流之后青年幸存者中PTSD症状网络模式的变化。进行了为期两年的纵向研究，追踪了灾难发生后3、15和27个月的1460名儿童和青少年。具有较高中心性的症状在不​​同时间点有所不同。睡眠问题和噩梦在3个月时显示出较高的集中度，并且其集中度随着时间的推移而降低，而生理线索反应性和闪回的集中度随着时间的推移而增加，并在27个月时达到较高水平。该网络的全球连接在27个月时比在3个月和15个月时更强。这些发现为青少年PTSD症状的发展提供了新颖的见解。PTSD症状的时间差异值得研究人员关注。在临床实践中，创伤后不同阶段应将急性和慢性PTSD结构中不同的核心症状作为目标。