Column #

Notes Explaining the Notation Used

Notation

1

Period of life between two age brackets(years)

$\left(x,x+n\right)$

2

Population figures which will be collected from source documents

$P_x$

3

Number of deaths within the age bracket

$D_x$

4

Proportion of persons surviving at the beginning of the age bracket who die during the age bracket

${}_{n}q{}_x$

5

Out of the number of newborns who started in the life table ( $l_0$ is called the radix, and is set at 100,000) the number surviving at the beginning of the age bracket

$l_x$

6

The number of persons in the cohort who die in the age bracket $\left(x,x+n\right)$

${}_{n}d{}_x$

7

Number of years of life (person-years of life in the age interval) lived by the cohort within the indicated bracket $\left(x,x+n\right)$

${}_{n}L{}_x$

8

Total person-years of life contributed by the cohort after attaining age x

$T_x$

9

Average number of years of life remaining for a person alive at the beginning of age bracket $\left(x,x+n\right)$

$e_x$