They go into various statistics yes.
But on a more qualitative note, tribal societies gain little from total war. "Total war" is the modern concept that every war is a struggle for existence and every avenue must be utilized to destroy the enemy culture/civilization.
In tribal societies most violent conflict was settled symbolically - Keegan goes into this in one of his books I forget which one.
For instance the tribes will line up against each other like in typical war and then attack each other, but due to various spiritual taboos against certain war practices, it's really more like a sport than what we consider war. There will be few casualties and most of the combat will be decided more like wrestling or, in some cases, even more like a dance competition. This is not a joke.
Obviously the particular superstitions and rituals differed among tribes, but hunter-gatherer warfare in general did not lead to even fractions of the amount of suffering that agricultural warfare leads to.
Having said all this, it's essentially impossible for hunter-gatherers to compete with agricultural civilization. It's a sort of prisoner's dilemma - whichever tribe "decides" to become agricultural will worse lives individually, but the collective is so powerful and efficient that it replicates itself.
Agriculture is better for our genes - we multiply far more. But hunter-gathering is better for our quality of life.