Sometimes Less is More: Switching Influence of Social Support on Posttraumatic Growth over Time after a Natural Disaster.

Few studies have investigated the causal link between social support and posttraumatic growth. Using a four-wave longitudinal design, the present study examined the reciprocal relationship between posttraumatic growth and social support in family and school contexts. A total of 285 adolescents (61.3% female) were recruited to complete self-report questionnaires 12, 18, 24, and 30 months after the Wenchuan earthquake. The data were analyzed using a random intercept cross-lagged panel model. Results revealed a trend for total social support initially promoting posttraumatic growth, followed by no influence, and finally a hindering of growth. This pattern varied between different sources of support. Specifically, the influence of support from parents and peers was consistent with the pattern for total support, whereas that from teachers and others prevented posttraumatic growth during later stages. These results suggest that timing is an important issue in posttraumatic growth and that providing more support for a prolonged period following a traumatic event constrains adolescents' autonomy and thus inhibits posttraumatic growth.