“…Moreover, independent and moderating variables were centred on their respective means to reduce multicollinearity between main effects and interactional terms, and to increase the interpretability of the weights for the interaction terms (Cohen, Cohen, West, & Aiken, 2013). In addition, gender, age, and severity of trauma were considered as compounding variables and controlled in each analysis, due to the relations between gender, age, and trauma severity and burnout (Galek, Flannelly, Greene, & Kudler, 2011; Lee, Puig, Lea, & Lee, 2013; Salmela-Aro & Tynkkynen, 2012). Specifically, we inserted compounding variables (e.g.…”