Faurie and Raymond studied several unindustrialized societies that had varying rates of homicide, using their own fieldwork and ethnographic literature. They excluded industrialized cultures since they tend to have more firearms and the use of firearms is unaffected by handedness.
At the lower extreme of their samples was the Dioula of Burkina Faso in which just 3.4% of the population is left-handed and only 0.013 murders are committed per 1000 people each year. At the upper extreme was the Eipo of Indonesia in which 27% of the population is left-handed and the homicide rate is three murders per 1000 people each year. The strong correlation between the proportion of left-handers and the number of homicides in each culture suggests that left-handers are more likely to survive a fight.
Since right-handed fighters train with mostly right-handed opponents. they have less experience fighting lefties. However, lefties also train with mostly right-handed opponents. This gives lefties a bit of an edge in the ring.
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