Provincial variations in catastrophic health expenditure and medical impoverishment in China: a nationwide population-based study.

Background: Financial protection, as a key dimension of Universal Health Coverage (UHC), has been under increasing attention in recent years. A series of studies have examined the nationwide extent of catastrophic health expenditure (CHE) and medical impoverishment (MI) in China. However, disparities in financial protection at the province level have rarely been studied. The aim of this study was to investigate provincial variations in financial protection as well as its inequality across provinces. Methods: Using data from the 2017 China Household Finance Survey (CHFS), this study estimated the incidence and intensity of CHE and MI for 28 Chinese provinces. Ordinary least square (OLS) estimation, using robust standard errors, was used to explore the factors associated with financial protection at the province level. Moreover, this study examined the urban-rural differences in financial protection within each province, and calculated the concentration index of CHE and MI indicators for each province using household income per capita. Findings: The study revealed large provincial variations in financial protection within the nation. The nationwide CHE incidence was 11.0% (95% CI: 10.7%, 11.3%), ranging from 6.3% (95% CI: 5.0%, 7.6%) in Beijing to 16.0% (95% CI: 14.0%, 18.0%) in Heilongjiang; the national MI incidence was 2.0% (95% CI: 1.8%, 2.1%), ranging from 0.03% (95% CI: 0.00%, 0.06%) in Shanghai to 4.6% (95% CI: 3.3%, 5.9%) in Anhui province. We also found similar patterns for provincial variations in intensity of CHE and MI. Moreover, substantial provincial variations in income-related inequality and urban-rural gap existed across provinces. Eastern developed provinces in general had much lower inequality within them, compared with central and western provinces. Interpretation: Despite the great advances towards UHC in China, substantial provincial variations exist in financial protection across provinces. Policymakers should pay special attention to low-income households in central and western provinces. Provision of better financial protection for these vulnerable groups will be key to achieving UHC in China. Funding: This research was supported by the National Natural Science Foundation of China (Grant Number: 72074049) and the Shanghai Pujiang Program (2020PJC013).