減少自殺死亡為國家首要之務，但沒有任何篩選測試可以預測一個人是否會自殺。在12月 份的Psychiatric Services中，西雅圖團體健康公司的研究團隊在參閱超過84,000名抑鬱症患者的 PHA-9定期管理問卷調查，發現回答第九項的患者企圖自殺或死亡的風險明顯增加。
Psychiatric Services, December 2013
Head Injury as Risk Factor for Psychiatric Disorders
過去幾十年來，安慰劑反應增加，其中檢驗點的增加及學術端隨機對照實驗的減少解釋了這個時間效應。
American Journal of Psychiatry, December 2013
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