The association between low socioeconomic status and depressive symptoms depends on temperament and personality traits

Socioeconomic status and personality traits are known to be associated with depression risk. We examined whether temperament and personality traits modified the association between socioeconomic status and depressive symptoms. The participants were 2678 individuals from the Cardiovascular Risk in Young Finns study, aged 18-49 during the three study waves in 1997, 2001, and 2007 included in the present study. Temperament was assessed with the Temperament and Character Inventory, personality with the Five Factor Model, and depressive symptoms with a modified version of Beck's Depression Inventory. Education, occupational status, and income level were used as indicators of socioeconomic status. Results of multilevel linear regression analysis indicated that low occupational status and income were associated with high depressive symptoms particularly in individuals with high neuroticism or harm avoidance, and with low extraversion or reward dependence. High persistence also strengthened the negative association between income and depressive symptoms, but this interaction effect was not observed with conscientiousness. The mental health risks of low socioeconomic status may therefore be most potent among individuals who are sensitive to negative and threatening stimuli.