GENEVA, Oct 21 — Non-communicable diseases account for three-quarters of deaths worldwide but affect different population groups in different ways, a World Health Organization study showed on Tuesday.

In its biggest-ever look at inequality in health and non-communicable diseases (NCDs), the WHO studied the top four killers — cancer, cardiovascular diseases, chronic respiratory diseases and diabetes.

It also looked at the five main risk factors driving them — tobacco use, alcohol consumption, obesity, unhealthy diets, physical inactivity and air pollution.

The report then scanned this across differences in NCD burden, prevention and care — by age, gender, economic status, education, place of residence, disability status, employment and migration status.