Assessing adult attachment after out-of-hospital cardiac arrest: an exploratory analysis and construct validation of the ECR-RS.

Aim: To explore the construct validity of the 'Experience in Close Relationships - Relationship Structures'-questionnaire (ECR-RS) in a population of out-of-hospital cardiac arrest (OHCA) survivors. Objectives were to (i) describe item- and scale-level response patterns, and (ii) evaluate the preliminary construct validity of the ECR-RS, including its dimensional (structural), known-groups, and convergent validity. Methods: An exploratory cross-sectional validation study, with OHCA survivors completing the ECR-RS, Hospital Anxiety and Depression Scale (HADS), and the mental health component from the Short Form-12 (SF-12 MCS) three months post- arrest. Descriptive statistics and floor/ceiling analyses were performed. Dimensional validity was assessed using response distribution patterns and exploratory factor analysis (EFA), followed by reliability using Cronbach's Results: Among 123 survivors (median age 59.9 years, 84 % male), ECR-RS total scores were low on both subscales and floor effects were observed at scale level (31 % for avoidant and 72 % for anxious attachment). EFA supported the expected two-factor structure, though item 4-6 showed poor loadings/cross-loadings. Internal consistency was acceptable (total scale Cronbach's Conclusion: The ECR-RS demonstrated partial construct validity among OHCA survivors, but item-level inconsistencies and pronounced floor effects limit its utility. Findings highlight the need for a revised instrument better suited to post-cardiac arrest relational and psychological dynamics.