青少年抑郁冲动性在知觉压力与自杀意念间的中介作用

Mediation effects of impulsivity and depression in the relationship between perceived stress and suicidal ideation in adolescents

目的探讨抑郁和冲动性在青少年知觉压力与自杀意念间之间的作用。方法采用知觉压力量表、抑郁自评量表、Barratt冲动性量表和自杀意念量表对291名青少年进行问卷调查。结果抑郁、冲动性、知觉压力和自杀意念两两之间呈显著正相关(r=0.36~0.58,P<0.01);知觉压力、冲动性和抑郁均对自杀意念有正向预测作用(R^(2)=0.33,F=23.04,P<0.001);知觉压力不仅能通过抑郁的独立中介作用(effect=0.03,P<0.001),还能通过冲动性和抑郁的链式中介作用预测自杀意念(effect=0.06,P<0.001),中介效应占总效应51.9%。结论知觉压力、冲动性、抑郁均与自杀意念相关,抑郁在知觉压力与自杀意念中起独立中介作用,冲动性抑郁在知觉压力与自杀意念中起链式中介作用。

Objective To explore the role of depression and impulsivity in the relationship between perceived stress and suicidal ideation in adolescents.Methods 291 adolescents were investigated by questionnaires,including the Chinese Perceived Stress Scale,Self-rating depression scale,Barratt Impulsiveness Scale Version 11 and Beck Scale for Suicide Ideation-Chinese Version.Results There was a significant positive correlation between depression,impulsivity,perceived stress and suicidal ideation(r=0.36~0.58,P<0.01).Perceived stress and depression had a direct negative predictive effect on suicidal ideation(R^(2)=0.33,F=23.04,P<0.001).Perceived stress not only mediated independently through depression(effect=0.03,P<0.001),but also predicted suicidal ideation through a chain mediating effect of impulsivity and depression(effect=0.06,P<0.001),with the mediating effect accounting for 51.9%of the total effect.Conclusion Perceived stress,impulsivity,and depression are all associated with suicidal ideation.Depression mediated independently between perceived stress and suicidal ideation,and impulsive depression mediated in a chain between perceived stress and suicidal ideation.