Table A2

Summary of studies used in selecting the control variables

Author(s)Objective and settingRelated control variable(s)Estimation techniqueResults
Arthur and Oaikhenan (2017) To find out how health expenditure affects health outcomes (infant mortality, under-five mortality, life expectancy) in 40 sub-Saharan African countriesTotal health expenditure, public health expenditure, private health expenditureFixed effects regressionHealth expenditure indicators were found to improve health outcomes
Immurana (2021a)To investigate the effect of FDI on life expectancy and death rate in 43 African countriesPhysician densityFixed effects and random effects regressionsFDI and physician density were found to improve life expectancy and death rate
Nketiah-Amponsah (2019) To assess the effect of health expenditure on health outcomes (maternal mortality, under-five mortality, life expectancy) in 46 countries in sub-Saharan AfricaTotal health expenditure, physician densityFixed effects and random effects regressionsIn general, health expenditure and physician density were found to be associated with improved health outcomes
Novignon and Lawanson (2017) To find out the effect of health expenditure on child health outcomes in 45 countries in sub-Sharan AfricaTotal health expenditure, public health expenditure, private health expenditureFixed effects and random effects regressionsWhile private health expenditure was insignificant, total and public health expenditure were found to enhance child health outcomes
Ziaei and Hammarström (2023) To find out the relationship between interpersonal violence and mental health symptoms in SwedenInterpersonal violenceGeneral linear regressionInterpersonal violence was found to have a positive association with mental health symptoms
Arshad et al. (2021) Among others, the study examined the effect of population growth on human development (including health) in PakistanPopulation growthAutoregressive distributed lag (ARDL) modelThe study found a negative association between population growth and human development

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