![]() While studies used a range of inputs, these generally considered the building blocks of health systems, health risk factors, and social determinants of health. A range of regression methods were used to identify the determinants of health system efficiency. Data envelopment analysis, a non-parametric method, was the most common methodological approach used, followed by stochastic frontier analysis, a parametric method. Only 6% of studies used either qualitative methods or mixed methods while 94% used quantitative approaches. ![]() ![]() There were also more publications focusing on national level (60%) compared to sub-national health systems’ efficiency. There were more publications from high- and upper middle-income countries (53%) than from low-income and lower middle-income countries.
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