Description: Chapter 8 states that there is great difficulty in projecting future mortality levels - the changing sex mortality differential is only one of the uncertainties. Some widely varying opinions for the future are offered. From Why Men Die Younger: Causes of Mortality Differences by Sex, M-LI01-1.

Description: Chapter 9 conclusions suggest that males have higher mortality throughout the world, at all ages, and for the vast majority of diseases. Evidence also suggests that there are significant biological reasons for the sex mortality differential, but these can be masked by environmental and behavioral factors. The author looks to the Human Genome Project for further understanding of this question. From Why Men Die Younger: Causes of Mortality Differences by Sex, M-LI01-1.