Personality traits are of course often intercorrelated, so that r-values in Table 1 are not independent of each other. In order to identify the unique contribution of each factor or sub-factor, multivariate examination is required. A large-sample multiple regression analysis was made possible by combining the three studies’ OPQ and job-engagement data (N = 741). Findings are shown on the right-hand side of Table 1, with and without the demographic