Hays P
Can J Psychiatry. 1980 Jun;25(4):314-8. doi: 10.1177/070674378002500407.
One hundred and fifty consecutive patients with unipolar psychotic ("endogenous") depression were investigated to illuminate any relationships existing between premorbid personality traits and the development of depressive illness. In some cases personality and psychological stress appeared to combine to produce depression, while in others physical stresses appeared to be the principal etiological agents, and to operate in the absence of personality and psychological factors. The contribution of these different factors to causation are discussed and explored.
对150例单相精神病性（“内源性”）抑郁症患者进行了连续研究，以阐明病前人格特质与抑郁症发病之间存在的任何关系。在某些情况下，人格和心理压力似乎共同作用导致抑郁，而在另一些情况下，身体压力似乎是主要病因，且在没有人格和心理因素的情况下起作用。探讨了这些不同因素对病因的贡献。
