You can assume that whatever causes the collapse of civilization will whittle that number down substantially. And, it's also why you get as far away from people as possible.
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exactly, and that is where the mass death would be the urban areas. between criminals killing people, no food, very little water. anyone who stays in a urban area chances are will be dead within 2 months.
take the population of the top 50 urban areas and that gives you a good idea on the death toll.
It is going to take real men to send their wives children tosafer ground while we able bodied men stay behind and devote our time, energy, and pain and suffering to rebuild our cities, our towns, villages, infrastructure, economy, etc. Some of us may die in the process. Some of us may suffer, But many of us will survive. Regardless of which category we fall into we will all be playing an invaluable role by staying behind where we are most needed rather than taking to the hills.
Matter of fact, many of those who take to the hills will find that its not as easy as they thought. During WW2 many Europeans discovered this when they tried to leave their cities and towns for the countryside. Many of them wound up returning.
It's going to take guts, hard work, determination, and pain, but we can do it.