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.

Radix

Radix convention: standard 100000 survivors at birth, or a unit radix of 1.

a0 rule

Separation factor convention for the first interval.

Width n

Width of the first age interval in years.

m0

Infant death rate m0 used only by the Coale-Demeny rule.

l0

Conventional life-table radix l0.

a0

Average years lived by those dying in the first interval, in years.

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.

• Perinatal Rate Definition Lookup

  Compute the perinatal mortality rate as late fetal plus early neonatal deaths per one thousand total births and state the WHO definitional convention used.

• Coale Demeny Region Family Lookup

  Validate and label a Coale-Demeny regional model life table family (West, North, East or South) at a mortality level from 1 to 25.

• Neonatal Postneonatal Split Lookup

  Split the infant mortality rate into its neonatal component (deaths under 28 days) and postneonatal component per thousand live births, with the neonatal share of infant deaths.