Multilingual Demographic Dictionary, second unified edition, English volume

Mean population (MEAN population)

Translation
Section	English 401	Arabic 401	Czech 401	German 401	Spanish 401	French 401	Italian 401	Japanese 401	Portuguese 401	Russian 401	Chinese 401
401-1	mortality	وفيات—موتان	úmrtnost	Sterblichkeit —Mortalität	mortalidad	mortalité	mortalità	死亡	mortalidade	Смертность	死亡
401-2	mortality rate —death rate	معدل الوفيات	míra úmrtnosti	Sterbeziffer	tasa de mortalidad	taux de mortalité	tasso di mortalità	死亡率	taxa de mortalidade	Коэффициент смертности	死亡率
401-3	death	موت	úmrtí	Sterbefall —Gestorbene(r)	defunciones —fallecimientos	décès	morti —decessi	死亡	óbitos	Смерти	死亡
401-4	crude death rate	معدل الوفيات الأولي—معدل الأولي السنوي للوفيات العامة	hrubá míra úmrtnosti	Rohe Sterbe-	tasa bruta de mortalidad —tasa bruta anual de mortalidad general	taux brut de mortalité —taux brut annuel de mortalité générale	tasso generico di mortalità —tasso di mortalità generale	粗死亡率（普通死亡率）	taxa bruta de mortalidade	Общий коэффициент смертности	粗死亡率
401-5	mean population —average population	متوسط عدد السكان	střední stav obyvatelstva	durchschnittliche Bevölkerung	población media del período	effectif moyen	popolazione media	平均人口	população média	Средняя численность населения	平均人口数
401-6	sex - age - specific death rate	معدل وفيات الأعمار حسب الجنس	specifická míra úmrtnosti podle pohlaví a věku	Geschlechts- und altersspezifische Sterbeziffer	tasa de mortalidad por sexo y grupos de edad	taux de mortalité par sexe et par groupe d’âges	tassi di mortalità specifici per sesso ed età	性・年齢別死亡率	taxas específicas de mortalidade por idade e sexo	Коэффициент смертности по половозрастным группам	性别年龄死亡率
401-7	age-specific death rate	معدل وفيات الأعمار	míra úmrtnosti podle věku	Altersspezifische Sterbeziffer	tasa de mortalidad por edad	taux de mortalité par âge	tasso di mortalità specifico per età	年齢別死亡率	Taxas específicas de mortalidade por idade	Повозрастные коэффициенты смертности	分年龄死亡率

The study of mortality ¹ deals with the effect of death on the population. The general terms mortality rate ² or death rate ² encompass all the rates (133-4) which measure the frequency of deaths ³. Where the expression death rate is used without any qualifying adjective the crude death rate ⁴ is usually meant (cf. 136-8 for a general discussion of crude rates). This is generally an annual rate and consists of the ratio of the annual number of deaths occurring during a calendar year to the number exposed to the risk of dying during the same period. This number is equivalent to the mean population ⁵ or average population ⁵ for the period, and the population at the mid-point of the period can usually be substituted for the average population without appreciable error, if the size of the population is changing fairly uniformly. If the mortality of a sub-population (101-6) only is studied, we speak of specific death rates (134-6) among which sex-age-specific death rates ⁶ are the most common. Age specific death rates ⁷ without distinction of sex are also used on occasion.

2. Occasionally the term mortality is used as a synonym for mortality rate or death rate.
3. Death, n. - die, v. - dead, adj. syn. - deceased, adj. or n.
5. When the observation period exceeds one year, the mean population is generally obtained as the average of several estimates of the size of the population for each year. The average number of persons years (135-6) is also used as denominator.