At any one time, mental health concerns, from mild anxiety to Alzheimer's disease, range from 19-29%. There is remarkable consisistency - One in Five (get image).
Burden is the combination of death and disability - quality of life matters just as much as quantity of life.
At least 75% of people with mental health disorders smoke.
10 leading causes of disability
By 2020, burden is projected to be:
World Mental Health Initiative 2004
Elderly - cognitive dysfunction with increasing age.
World War II - unprecedented number of psychiatric breakdowns, and from there looked into the population as a whole.
World Mental Health Initiative 2000 - Global Burden of Disease.