Life expectancy

A measure of the average time a person is expected to live, based on the year of its birth, its current age and other demographic factors. Most commonly refers to life expectancy at birth.


Mortality rate

The mortality rate is a metric for the number of deaths (in general, or due to certain causes) in a defined population. It is typically expressed in units of deaths per 1,000 individuals per year.


Total fertility rate

The total fertility rate of a population is the average number of children that would be born to a woman over her lifetime if:

  • She was to experience the exact current age-specific fertility rates through her lifetime, and
  • She was to survive from birth to the end of her reproductive life.

A total fertility rate of about 2.1 children per woman is called replacement-level fertility.


Disability-Adjusted Life Years (DALYs)

The disability-adjusted life year (DALY) is a measure of overall disease burden, expressed as the number of years lost due to ill-health, disability or early death.

Disability adjusted life years =
Years lived with disability (weighted by disability weight)
Years of life lost (compared to expected life years)

Disability adjusted life years
Disability adjusted life years (Source, CC BY-SA 3.0)

Quality-Adjusted Life Years (QALYs)

Quality-Adjusted Life Years are a measure of life expectancy and health.

One QALY equals to one year in perfect health. If an individual’s health is below this maximum, QALYs are accrued at a rate of less than 1 per year.



A benchmark for algorithms judging semantic similarity of sentences from the biomedical domain.