| Years of life lost (YLL) | A measure of premature mortality in the population Corresponds to the number of deaths (N) multiplied by the standard life expectancy (L) at the age at which death occurs for a given cause, age and sex: YLL=N×L |
| Years lost due to disability (YLD) for people living with the health condition | Prevalence YLD: YLD=P×DW×L where P is the number of prevalent cases; DW is the disability weight, a weight factor that reflects the severity of the disease on a scale from 0 (perfect health) to 1 (dead); and L is the average duration of the case until remission or death (years) |
| Disability-adjusted life-year | One DALY can be thought of as one lost year of “healthy” life A measurement of the gap between current health status and an ideal health situation where the entire population lives to an advanced age, free of disease and disability DALYs for a disease or health condition are calculated as the sum of the YLL due to premature mortality in the population and the years lost due to disability (YLD) for people living with the health condition or its consequences: DALY=YLL+YLD |
| Developed regions | High-income Asia Pacific, Western Europe, high-income North America and Australasia |
| Developing regions | A nation with a lower living standard, underdeveloped industrial base and low human development index (HDI) relative to other countries |