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Parents of children with autism spectrum disorder (ASD) experience posttraumatic growth (PTG). No study has investigated the moderating effect of social support and family function between symptom severity and PTG. The study aims to examine whether social support and family function moderate the relationship between symptom severity and PTG among parents of children with ASD. Using a cross-sectional design, a total of 385 parents of children with ASD were recruited from September 2019 to November 2020 by convenience sampling. Participants completed the Posttraumatic Growth Inventory, Social Support Rating Scale, Autism Behavior Checklist, and Family Apgar Index. Both social support (r = 0.354, p 0.05), social support moderated the correlation between symptom severity and PTG [β(SE) = -0.134 (0.719), p 0.05). Higher social support appears to buffer the detrimental effect of symptom severity on PTG, and social support seems to be an important factor when delivering interventions aimed at decreasing symptom severity and improving positive growth. LAY SUMMARY: Both social support and family function were positively associated with PTG. Providing sufficient perceived social support and enhancing family function promoted parents' positive psychological experience. Higher social support seemed to buffer the detrimental effect of symptom severity on PTG, and it could be an important intervention target for improving the psychological growth of parents of children with ASD.
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