glossary    * M *
Demographical and statistical terms Symbols
is the act, ceremony or process by which the relationship of husband and wife is constituted. The legality of the union may be established by civil, religious, or other means as recognized by the laws of each country.
maternal mortality
according to ninth revision of the International Classifications of Diseases, "maternal death" is defined as the death af a woman while pregnant or within 42 days of termination of pregnancy, from any cause related to or aggravated by the pregnancy or its management but not from accidental or incidental causes.
maternal mortality rates
are the annual number of maternal deaths divided by the live births in the same year.
is used to denote a confinement resulting in the birth of one or more children.
maximum resistance value at age xm
represents the maximum value which the function (or distribution) of resistance reached at age xm.
r(xm) or R(xm)
mean age of a population
is the average age of all its members.
median age of a population
is the age which divides the population into two numerically equal groups
mean age of childbearing
represents the mean age of the mothers at childbirth.
median length of life
is the age at which half the original cohort of births have died
P o

mid-year population estimate
refer to the de facto population on 1 july, or to the mean of two year-end official estimates.
an individual whose place of residence differs at the beginning and the end of a certain interval of time.
the movement of people across a specified boundary for the purpose of establishing a new permanent residence. Divided into international migration (migration between countries) and internal migration (migration with a country).
model life table
is a life table which is based only upon the generalization of empirical relationships derived from a group of observed life tables.
monozigotic twins
occur when one ovum splits after fertilization; the resulting children must always be the same sex.
mortality rate at age x (see Central death rate at age x)
n m x ; n M x

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