The effects of income, education and age on health
利用1987-1994年美国健康访谈调查数据，发现教育与收入对死亡率和自评健康的影响随年龄增长而减弱，主要原因是老年期普遍的生物退化。
We use the core interviews of the US Health Interview Survey for the years 1987-1994, to study the effects of socioeconomic status (SES) on mortality and self-reported health. We find, consistent with previous studies, that the relationship between mortality and indicators such as education and income diminishes with age. We consider new explanations for this result and conclude that general biological deterioration at old age is probably the principal one. One important piece of evidence for this conclusion is the finding that there is no relationship at all between mortality and SES for people whose self-reported health status at baseline is either fair or poor.