-
Definition
of “population”
- group of people that live in a determined geographical area,
- defined by number of people (size); composition (biological and social variables): age, sex, civil status; Geographical settlement (location)
-
Definition
of static and dynamic demography
- Static demography: studies population in a determined moment
- (like taking a photo in a precise instant).
- Dynamic demography: studies population along time (changes due to people coming
- in and out of the group)
-
Demography
concept
- UNO: science
- that studies human population (size, structure, evolution) from a quantitaive
- point of view
-
Is
demography useful for Public Health?
- yes,
- demography provides data about population used for:
- - rates and other health indexes
- - epidemiological studies
- - public health management and planning
-
Static
demography sources:
- census, poll, approximative methods, active
- population survey.
-
Census concept
- census is the main data source for static demography group of activities directed to gather, analyse and issue demographic, cultural, economical, social data of all inhabitants of the country in a determined
- moment
-
Types of
census populations:
- in fact population= people living+ transients,
- population
- with rights= residents present and absent (with usual residence)
-
Conditions to be met by a true census:
/ census characertistics
- universal:
- it must include all the inhabitants of the country,
- data are
- collected in an individualized manner,
- mandatory
- filling in,
- secret content
- statistic document
- census must be made simultaneously in the whole country
-
Definition
of “census moment”
- census must
- be made simultaneously in the whole country. As filling in all the census
- sheets takes time, this is reached asking everbody to answer it in reference to
- a determined day and hour
-
Definition of poll
- council
- poll is the second data source in static demography. Poll is an
- administrative record including all neighbours. It's data proof that somebody
- is living in the council. it includes residents and temporary residents
- (transients)
- it
- includes personal data necessary for legal relations: age, sex, civil status,
- place of birth, job
-
State several differencies and similarities
between census and poll
- poll:
- is an administrative
- public document that can be used for statistical studies
- made by the council
- census moment is every 5 years
-
- census:
- is a statistical document
- made by government of the nation
- census moment is every 10 years
-
-
- poll +census data are individual, universal, taken simultaneously, are studied by
- the spanish national institute of statistics.
-
Simple census and partial census
- simple
- census: it is a census that gathers only a small number of data, even only
- one data, keeping it s being universal. It is made to update deographic data
- without having to wait for 10 years until the next census
- partial
- census: survey is made only on one part of the population, that has been
- selected for it s being representative
- of the whole community
-
What is an
approximative method?
is a static demography source
- definition:
- in many countries of the world we dont have census or polls, and general data
- about population is based on estimations. they are approximative data
-
Usefulness of active population survey
- provide
- important information in intercensus periods
-
Basic shapes
of population pyramids:
- pagoda
- (progressive), bell (stabilized), money-box (regressive)
-
Sundbarg
index: what is it useful for?
- classify population in 3 age groups:
- from 0-14
- from 15-50 (principal interval, 100%)
- more than 50 years
- dont differenciate men and women
-
Static
demography indexes:
- Bürgdofer, dependence relation (total, third
- age and youth), aging index, Sauvy index
-
Ratio
men/women in Spain, according to age
- at birth:
- 1,07men/women
- more than 65 years: 0,73men/women
- total population: 0,98men/women
- average age of resident population: 40 years (38,6 men, 41,4 women)
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