University of Central Lancashire, Preston, UK.
Suicide Life Threat Behav. 2009 Oct;39(5):463-70. doi: 10.1521/suli.2009.39.5.463.
Suicides are associated with both high and low levels of intelligence and educational attainment in both individual-level and aggregate-level studies. A cross-national study examining the relationship between general population suicide rates (y) and educational attainment (x) was undertaken with the a priori hypothesis that the relationship would be curvilinear and follow a U-shaped curve with the quadratic equation Y = A + BX + CX(2), where A, B, and C are constants. Data on suicide rates and the Education Index (a proxy measure of educational attainment) were ascertained from the World Health Organization and the United Nations Web sites, respectively. The main finding was the predicted curvilinear relationship between general population suicide rates, in both sexes, and the Education Index fit the above quadratic equation. Given the cross-sectional study design, a causal relationship cannot be assumed. The impact of educational attainment on general population suicide rates may occur through interaction with other factors, mediation of the effects of other factors, or by its effects being mediated by other factors, and require further study.
自杀与个体和总体水平上的智力和教育程度高低都有关。一项跨国研究检查了一般人群自杀率（y）与教育程度（x）之间的关系，先验假设是该关系呈曲线关系，遵循 U 形曲线，二次方程为 Y = A + BX + CX(2)，其中 A、B 和 C 是常数。自杀率和教育指数（教育程度的代理指标）的数据分别从世界卫生组织和联合国网站获得。主要发现是，两性一般人群自杀率与教育指数之间呈预测的曲线关系，符合上述二次方程。鉴于横断面研究设计，不能假定存在因果关系。教育程度对一般人群自杀率的影响可能通过与其他因素的相互作用、其他因素影响的中介作用或通过其他因素的中介作用发生，需要进一步研究。
