>this study shows that medium development countries have significantly lower suicide rates than high and very high development countries That basically follows

>this study shows that medium development countries have significantly lower suicide rates than high and very high development countries That basically follows from the definition of HDI: one of the three components of HDI is life expectancy, so even if people in countries of different HDI would have equal tendencies to commit suicide, a lower proportion of people would actually end up committing suicide in lower HDI countries as they would likely die due to other causes either at birth or later.