Finally, the role of personality/temperament may differ for different forms of depressive disorder. Personality appears to play an especially important role in early-onset, chronic, and recurrent depressive conditions (e.g., Klein 2008, Kotov et al. 2010, van Os et al. 1997). Focusing on broad diagnostic categories such as MDD may obscure important associations with particular forms of depression; hence, future studies need to give greater consideration to the heterogeneity of depressive disorders.
