Peer and Supervisor Support As Moderators of Secondary Traumatic Stress Related Functional Impairment

Background and Purpose
Secondary traumatic stress (STS) is a common occupational hazard among trauma-exposed professionals and is associated with significant functional impairment. While much of the literature has focused on individual-level protective factors, increasing attention has been directed toward the role of organizational supports in mitigating STS and its consequences. Peer support and supervisor support represent two central, modifiable components of organizational support; however, little is known about how these resources operate jointly. This study examined the interactive (moderated moderation) effects of peer and supervisor support on the relationship between STS symptoms and STS-related functional impairment.

Methods
This study utilized a cross-sectional secondary analysis of data from 450 master’s-level social workers. Participants completed validated measures of STS symptoms (Secondary Traumatic Stress Scale), functional impairment (Secondary Trauma Impact Scale), and workplace support (Peer and Supervisor Support Scale). Hayes’ PROCESS macro (Model 3) was used to test a three-way moderation model, with STS symptoms as the predictor, peer and supervisor support as moderators, and functional impairment as the outcome. Conditional effects were examined at low (16th percentile), medium (50th percentile), and high (84th percentile) levels of each moderator using bootstrapped 95% confidence intervals.

Results
The overall model was statistically significant, explaining 33.1% of the variance in functional impairment (p < .001). STS symptoms were a strong positive predictor of functional impairment. Neither peer support nor supervisor support demonstrated robust independent main effects; however, both significantly moderated the relationship between STS symptoms and functional impairment. Specifically, the STS × Peer Support and STS × Supervisor Support interactions indicated that higher levels of each support type weakened the association between STS symptoms and impairment. The three-way interaction between STS symptoms, peer support, and supervisor support was also statistically significant (b = 0.0002, p < .05), indicating that the buffering effect of one form of support depends on the level of the other. Conditional effects analyses showed that the STS–impairment relationship was strongest when supervisor support was low, regardless of peer support levels. In contrast, high supervisor support substantially attenuated this relationship across all levels of peer support. Peer support demonstrated a compensatory effect, with stronger buffering effects observed primarily in contexts of low supervisor support.

Conclusions and Implications
Findings indicate that organizational support processes are interactive and context-dependent rather than independent. Supervisor support appears to play a primary role in buffering the effects of STS on functional impairment, while peer support functions as a compensatory resource when supervisory support is limited. These results suggest that workplace interventions should prioritize strengthening supervisory support structures while also fostering peer support networks. A comprehensive, systems-level approach to organizational support may be necessary to effectively mitigate the functional impact of STS. This study advances the literature by demonstrating that the protective effects of workplace support are dynamic and interdependent, underscoring the importance of considering multiple organizational resources simultaneously in both research and practice.