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(open)

Life-table survivors at the start of the open terminal interval.

Terminal m

Death rate at the open terminal age m-omega per person-year.

L(open)

Person-years lived L in the open terminal interval, l / m.

e(open)

Remaining life expectancy at the open age, 1 / m.

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.

• 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.

• AX Average Years Dying Rule Calculator

  Compute the average person-years lived by those dying in an interval under the midpoint rule (a = n/2) or the Coale-Demeny infant rule (a0 = 0.07 + 1.7 m0), then convert the death rate to the life-table probability of dying q = n m / (1 + (n - a) m).

• Brass Relational Logit Alpha Beta

  Fit a life table with the Brass relational logit system Y_fit = alpha + beta * Y_standard applied through logit(s) = 0.5 ln((1-s)/s), returning fitted survivorship values for each standard survival probability.