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KMID : 0613620190390020548
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Health Social Welfare Review
2019 Volume.39 No. 2 p.548 ~ p.579
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Estimating the Medical Costs of BMI and Obesity in Korea: A Control Function Approach
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Lee Yong-Woo
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Abstract
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This study analyzed the effects of body mass index (BMI) and obesity status on individual medical expenditures in Korea, using the control function method to control for unobserved individual heterogeneity and the two-part model to consider the characteristics of medical expenditure variables. For this purpose, the Korea Heath Panel (2009-2015) is utilized. The study found that an increase in one unit of BMI in the overall sample resulted in an additional annual medical expenditures of about 50,000 won, while being -obese, compared to being non-obese, caused an additional annual medical expenditure of 920,000 won. Furthermore, the results of the quantile regression show that BMI and being -obese have a greater effect on the upper tail of the health expenditure distribution. Also, in most of the results, the estimation coefficients for the control function variable are significantly negative, indicating that underestimation may occur if the endogeneity is not properly controlled.
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KEYWORD
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Body Mass Index and Obesity, Medical Expenditures, Control Function, Two Part Model
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