Factors that helped me distinguish between core and periphery countries are political standing (Ex. Place in the United Nations, positions of power). I also used rates of life expectancy and infant mortality. This shows the quality of healthcare in these countries. Generally, the core countries have decent healthcare for their populous. The periphery countries tend to be poorer, not being able to afford adequate healthcare for their citizens.
Look at the data for more and less developed countries. What demographics do core countries have in common? Periphery?
Demographics that developed countries share include infant morality rates, life expectancy, and percent urban. The only