Table 4.

Regression results of the Tobit regression model

Variables	Coefficient (95% CI)	P value
Main DEA model regression results
Population density (people per sq. km of land area)	0.0449317 (−0.1083365 to 0.018473)	0.165
Gross domestic product (GDP) per capita (current US$)	0.0672207 (0.0085992 to 0.1258422)	0.025**
Urban population (% of total population)	0.4827829 (−0.8157207 to −0.1498452)	0.004***
Population ages 65 and above (% of total population)	0.0113915 (−0.0151828 to 0.0379659)	0.401
Literacy rate, adult total (% of people ages 15 and above)	0.4643171 (−0.4930024 to 1.421637)	0.342
Current health expenditure (CHE) as percentage of GDP (%)	0.0093055 (−0.0523179 to 0.0709289)	0.767
Main SFA model regression results
Population density (people per sq. km of land area)	0.0188001 (0.0046622 to 0.0329381)	0.009***
GDP per capita (current US$)	0.0021588 (−0.0138504 to 0.0095328)	0.717
Urban population (% of total population)	0340433 (−0.0089688 to 0.0770553)	0.121
Population ages 65 and above (% of total population)	0.0003696 (−0.0020561 to 0.0013168)	0.667
Literacy rate, adult total (% of people ages 15 and above)	0.006653 (−0.0238764 to 0.0238764)	0.669
CHE as percentage of GDP (%)	0.0010322 (−0.0018335 to 0.0038979)	0.480

*p<0.1, **p<0.05, ***p<0.01.⁴³

DEA, data envelopment analysis; SFA, stochastic frontier approach.