Network structure of PTSD symptoms in Chinese male firefighters.

The network perspective of mental disorder offers a novel way of understanding the psychopathology of post-traumatic stress disorder (PTSD). In this framework, PTSD may arise from direct interactions between its symptoms. In the present study, we used the Post-Traumatic Stress Disorder Checklist-civilian Version (PCL-C) to investigate the network structure of PTSD symptoms in 994 Chinese male firefighters. We also calculated the micro (i.e., edges weight and node expected influence) and middle (i.e., community) indicators of the final network. Nine strongest edges existed in the final network were from the same dimension of PCL-C, like "avoidance of thoughts" and "avoidance of reminders". Symptoms "emotional reactivity", "avoidance of reminders" and "exaggerated startle response" had the highest expected influence. As for the results of community detection, the spinglass and walktrap algorithm detected the same three communities which are slightly different from the original dimensions of PCL-C (i.e., symptoms "avoidance of thoughts", "avoidance of reminders" and "trauma-related amnesia" of avoidance dimension of PCL-C were added to the intrusion dimension of PCL-C). The present study explored the network structure of PTSD symptoms in Chinese male firefighters and provided several implications for clinical prevention and intervention to address the mental health needs in this special group.