Use this mortality or life-table method when age intervals, deaths, exposures, survivorship, and open-ended interval assumptions refer to the same population and period.

l(x)

Life-table survivors l(x) at the initial age.

l(x+t)

Life-table survivors l(x+t) at the later age reached by the cohort.

Survival ratio

Survival ratio l(x+t) / l(x) used to project the cohort across the census interval.

Life-table results depend on age grouping, exposure quality, the treatment of the first and terminal intervals, and assumptions about deaths within each interval. Sparse deaths can make rates unstable.

Complement a summary mortality result with age-specific death rates, survivorship, and exposure counts. A complete life table is preferable when the question involves several ages or remaining life expectancy.

• MMR Maternal Mortality Ratio Calculator

  Compute the maternal mortality ratio as deaths attributed to pregnancy and childbirth per one hundred thousand live births.

• Abridged To Complete Extension Open Calculator

  Extend an abridged life table into the terminal open interval using L = l / m for person-years lived and e = 1 / m for the remaining expectancy at the open age.

• Adult Mortality 45q15 Calculator

  Convert age-specific death rates for the five-year groups from age 15 into the probability of dying between ages 15 and 60 using q = n m / (1 + (n - a) m), with a default a of n/2 years.