“…During the late 2010s, some high-income nations, including the USA, have had mortality spikes, particularly among the 15–39-years age group, which reflect mortality patterns associated with increased drug and alcohol misuse and mental health disorders. 43 , 44 The 15–39-years age group is particularly volatile globally, and is the age group most affected by fatal discontinuities such as conflict. 45 Sex differences in mortality vary widely across the globe.…”