The Perceived Informal Support Questionnaire: Validation and Clinical Correlates in People with Post-Traumatic Stress Disorder Symptoms

Purpose: This study developed and validated a novel measure that captures the diverse positive experiences related to perceived informal support. We also examined its cross-sectional and longitudinal correlates in people with post-traumatic stress disorder (PTSD) symptoms. Method: We analyzed data from an international clinical trial. Participants with PTSD symptoms completed assessments at baseline (N = 230) and after 1 month (N = 80). Results: The 34-item Perceived Informal Support Questionnaire (PISQ) had a two-factor structure, was internally consistent, and showed convergent validity with a general measure of social support. Additionally, baseline emotional support predicted fewer depressive symptoms (β = -.356, p = .015) and lower levels of impairments (β = -.271, p = .018) at 1-month follow-up. Discussion: This study offers a novel measure that captures the diverse experiences related to perceived informal support. It also highlights the importance of involving and supporting caregivers of individuals with mental health struggles, specifically PTSD symptoms.