中老年人群的健康问题受到越来越多的关注，越来越多的学者开始对中老年人群的健康消费进行研究。在本研究中，我们利用Harmonized CHARLS数据探讨收入与卫生支出之间的关系，发现收入对被调查者的健康支出有显著的影响，健康支出的收入弹性约为0.023，这意味着医疗保健对被调查者来说仍然是一种必需品。另外，由于有相当一部分医疗支出为零，因此我们考虑使用Tobit模型进行回归分析受访者医疗支出的影响因素。研究结果表明，家庭收入对医疗支出的影响是显著的，养老保险收入和转移支付收入对医疗支出的影响也是显著的。

The health problems of middle-aged and older people have received more and more attention, and more and more scholars have begun to study the health consumption of middle-aged and older people. In this study, we explore the relationship between income and health expenditure by using Harmonized CHARLS data, finding that there has significant effect of income on health expenditure of respondents, and income elasticity of health expenditure is approximately 0.023, which implies that health care is still a necessity for respondents.

In addition, because there are quite a few health expenditures that are zero, hence we consider using Tobit model for regression to analyze the influencing factors of respondent's health expenditure. We explore both Tobit analysis of OLS model and random Tobit analysis, and present the marginal effects. The results reveal that the effect of household income on health expenditure is significant, as well as pension income and transfer income.