Fertility

a birth rate
Parity: number of children born to a woman
Gravidity:

number of pregnancies a woman has had
Fecundity: physiological capacity to conceive
Infecundity: inability of a woman to conceive
Primary sterility: never able to conceive
Secondary sterility: inability to conceive after one or more children
Fecundability: probability that a woman will conceive during menstrual cycle

level and structure of death rate.

Birth rate and death rate

can be taken like indices of medico-preventive establishments’ efficiency.

So, the knowledge of demographic statistic questions, skill to calculate and analyze of data are very important in medical activity.

fertility levels in a population during some time period


To find

a time trend in fertility in study of differential fertility by different groups like ethnic, racial.


Quantify the birth performance of a population over a period of time

births per 1,000 in a year

per 1,000 and uses the number of woman who are

of child bearing age (15-49) in a population as a base for calculation of BR rather than total population.
Only age is taken.

So to calculate:

a specific age in a given year
Fertility rates is calculated

for a specific age groups
Age specific fertility rate is a measure of the number of children born to each age group, in relation to the number of woman in that age group.
For this 7 age groups are used across span of 15-49 and usually 1,000 woman are used.
To calculate:

born to a woman by the time she ended childbearing,

if she passed through all her childbearing years conforming to the age-specific fertility rates of a given year.

born to a women or group of women if she

survive to at least age 49 and conformed to the age-specific fertility rate at a given year.

GRR is restricted to the number of female children. The value of GR is ½ of total of FR
To calculate: