LAUSR

ABSTRACT Elucidating whether PTSD symptoms predict poorer social connectedness over time (i.e. social erosion) and/or that poor social connectedness contributes to maintenance of PTSD (i.e. social causation) has implications for PTSD treatment and relapse prevention. Most extant research has been cross-sectional and examined overall PTSD symptoms. Evidence of longitudinal associations among heterogeneous PTSD symptom clusters and social connectedness could provide insight into more nuanced targets for intervention. Using data from 1,491 U.S. military veterans in residential treatment for PTSD at 35 Department of Veterans Affairs facilities, we evaluated a two-wave cross-lagged panel model including a five-factor model of PTSD and two aspects of social connectedness. PTSD, quality of connectedness (i.e. degree of distress related to interpersonal conflict), and structural social support (i.e. number of days of contact with supportive loved ones) in the past 30 days were assessed at baseline and 4 months after discharge. The largest effect was greater severity of PTSD dysphoric arousal symptoms (i.e. irritability/anger, poor concentration, and sleep problems) at baseline predicting more conflict-related distress at follow-up (β = 0.43). Post-hoc symptom-level analyses indicated that irritability/anger drove this association. In addition, conflict-related distress predicted greater PTSD symptom severity across all five clusters (β’s = 0.10 to 0.14, p’s < 0.01). More days of contact predicted lower severity of avoidance and numbing symptoms (β’s = −.05 and −.07, p’s < 0.01), along with individual symptoms within these clusters, plus flashbacks. Results support both social erosion and social causation models. Engaging loved ones in veterans’ treatment and targeting dysphoric arousal symptoms, particularly anger and irritability, may improve long-term PTSD and relationship outcomes, respectively. HIGHLIGHTS • Sample: 1,491 military veterans in residential treatment for PTSD.• Examined 5-factor model of PTSD and social connectedness measured twitreatment baseline and 4 months after discharge.• Baseline dysphoric arousal (anger, sleep problems, poor concentration) predicted distress related to interpersonal conflict; anger drove this association.• Conflict-related distress at baseline predicted symptoms in all clusters at follow-up.• More days of contact with supportive loved ones at baseline predicted less avoidance and numbing.