“Results revealed that parasite prevalence predicted measures of authoritarian governance, and did so even when statistically controlling for other threats to h

“Results revealed that parasite prevalence predicted measures of authoritarian governance, and did so even when statistically controlling for other threats to human welfare.” There are so many varied and interacting and nonlinear threats to human welfare that I don’t know if the number of variables to control for (if even identifiable and measurable and appropriately transformed) would allow for meaningful result with only a few hundreds countries as data points.