The models were set up separately with psychosocial conditions and safety climate,
respectively, as predictors. All variables were standardized prior to the analysis. The
significance levels of the parameter estimates in both the structural equation models and the
multilevel models were assessed using the critical ratio (CR) or Wald test, i.e., the ratio
between the parameter value and the standard error of the parameter, with a ratio greater than
1.96 indicating significance (p < .05) (Hox, 2010; Kline, 2005).