"In the study, Zheng took into account a variety of factors, other than
medical expansion, that may be related to health. He included
country-wide variables like economic development and life expectancy at
birth. He also included individual-level variables, such as whether
people were married, their levels of education and their income.
Even after all these factors were taken into account, all three
types of medical expansion were associated with poorer subjective health
over time."
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