Am J Epidemiol. 2014 Aug 1;180(3):280-7. doi: 10.1093/aje/kwu128. Epub 2014 Jul 3.
Longitudinal studies at the level of individuals find that employees who lose their jobs are at increased risk of death. However, analyses of aggregate data find that as unemployment rates increase during recessions, population mortality actually declines. We addressed this paradox by using data from the US Department of Labor and annual survey data (1979-1997) from a nationally representative longitudinal study of individuals-the Panel Study of Income Dynamics. Using proportional hazards (Cox) regression, we analyzed how the hazard of death depended on 1) individual joblessness and 2) state unemployment rates, as indicators of contextual economic conditions. We found that 1) compared with the employed, for the unemployed the hazard of death was increased by an amount equivalent to 10 extra years of age, and 2) each percentage-point increase in the state unemployment rate reduced the mortality hazard in all individuals by an amount equivalent to a reduction of 1 year of age. Our results provide evidence that 1) joblessness strongly and significantly raises the risk of death among those suffering it, and 2) periods of higher unemployment rates, that is, recessions, are associated with a moderate but significant reduction in the risk of death among the entire population.
纵向个体研究发现,失业员工的死亡风险增加。然而,对总体数据的分析发现,在经济衰退期间失业率上升时,人口死亡率实际上下降。我们通过使用美国劳工部的数据和一项针对个人的全国性代表性纵向研究(收入动态面板研究)的年度调查数据(1979-1997 年)来解决这一矛盾。我们使用比例风险(Cox)回归分析了死亡风险如何取决于 1)个体失业和 2)州失业率,作为反映背景经济状况的指标。我们发现,1)与就业者相比,失业者的死亡风险增加了相当于 10 年的年龄,2)州失业率每增加一个百分点,所有个体的死亡率风险就会降低相当于 1 年的年龄。我们的研究结果表明,1)失业会极大地增加那些失业者的死亡风险,2)较高的失业率时期,即经济衰退,与整个人口的死亡风险的适度但显著降低有关。