Table 1.

Variables used in regression model.

	Source	Description
Independent Variable
WHO healthcare system score	WHO world health report 2000 [18]	The score was based on a system’s responsiveness to patients, the fairness of financial distribution, the overall national level of health, and the distribution of health
Physician density	WHO global atlas of the health workforce 2008 [19]	Estimated number of physicians per 100,000 population
Gross domestic product (GDP)	World development indicators database, world bank (2007) [20]	Estimated purchasing parity gross domestic product per capita in US$
Total health expenditure (THE)	World development indicators database, world bank (2007) [20]	Estimated total (government and private) health expenditure per capita in US$
Radiation therapy	International atomic energy agency’s directory for radiotherapy 2010 [21]	Total external beam radiotherapy devices per capita (TEBD)
Control Variable
HIV rate	CIA world factbook 2008 [22]	Estimated percent of population infected by HIV
Rural population	UN world urbanization prospects (2007) [23]	Estimated percent of population that live in rural area
Ethanol consumption	WHO global alcohol report (2011) [24]	Estimated per capita liters of ethanol consumed
Male smoking rate	WHO report on the global tobacco epidemic 2008 [25]	Estimated percent of men who smoke tobacco regularly
Female smoking rate	WHO report on the global tobacco epidemic 2008 [25]	Estimated percent of women who smoke tobacco regularly
Male obesity rate	WHO global database on bmi (2008) [26]	Estimated percent of men who have a BMI > 30
Female obesity rate	WHO global database on bmi (2008) [26]	Estimated percent of women who have a BMI > 30

This table shows the independent variables and control variables that were used in the regression model, as well as the source and description of each variable.