Table 2.

Factors affecting inequality in the distribution of Covid-19 vaccine

Main categories	Subcategories	Factors	References
Macro level (country)	Economic	Stability and country’s economic status	[32–35]
		GDP per capita	[35–38]
		Financial support	[33, 36]
		Human development index	[35, 36]
	Infrastructure and health system	Appropriate information system	[33]
		Functional cold chains in vaccine Transport	[33]
		Transport infrastructure	[33]
		Medical and non-medical facilities per capita	[32, 37]
		Healthcare provision and access	[32, 33]
		Healthcare quality	[32]
	Legal and politics	Vaccination allocation rules	[33]
		Health policies	[37]
		Political ideology	[32]
		Racial bias	[32]
	Epidemiologic and Demographic	Covid-19 incidence rate	[32, 36, 39]
		Covid-19 deaths rate	[36, 40]
		Life expectancy	[36]
		Vulnerability to covid-19	[36]
		Working in medical setting	[40]
		Comorbidities	[40]
		Social vulnerability	[41]
		Incarceration index	[34]
		Education index	[32, 34, 42]
Micro level (individual)	Economic characteristics	Household’s income	[33, 39, 40, 42–46]
		Home ownership	[39]
		Employment	[34, 39, 43]
		Poverty	[36, 43, 47]
		Access to healthy food	[39]
		Residency in the deprived areas	[45, 47–49]
	Demographic and social characteristics	Sex	[39, 49]
		Age	[34, 36, 39, 40, 42, 44–46, 48, 50, 51]
		Race	[32, 34, 40–44, 48, 51–53]
		Ethnic	[41, 44, 45, 48, 49, 52, 53]
		Religion	[48]
		Disability	[48]
		Location (urban/rural)	[39, 46, 49]
		Insurance coverage	[39]