Table
1
Table 1 presents
live births by sex and live-birth rates by urban/rural residence for as many
years as possible between1980 and 1999.
Description
of variables: Live birth is defined as the complete expulsion or extraction from
its mother of a product of conception, irrespective of the duration of
pregnancy, which after such separation, breathes or shows any other evidence of
life such as beating of the heart, pulsation of the umbilical cord, or definite
movements of voluntary muscles, whether or not the umbilical cord has been cut
or the placenta is attached; each product of such a birth is considered
live-born regardless of gestational age[1].
Statistics
on the number of live births are obtained from civil registers unless otherwise
noted.
The urban/rural classification of birth is that
provided by each country or area; it is presumed to be based on the national
census definitions of urban population.
Reliability
of data: Each country or area has been asked to indicate the estimated
completeness of the live births recorded in its civil register. These national assessments are indicated
by the quality codes (C), (U), and (...) that appear in the first column of this
table.
C
indicates that the data are estimated to be virtually complete, that is,
representing at least 90 per cent of the live births occurring each year, while
U indicates that data are estimated to be incomplete, that is, representing less
than 90 per cent of the live births occurring each year. The code (...) indicates that no
information was provided regarding completeness.
Data
from civil registers which are reported as incomplete or of unknown completeness
(coded U or ...) are considered
unreliable. They appear in italics
in this table.
These
quality codes apply only to data from civil registers. If a series of data for a country or
area contains both data from a civil register and estimated data from, for
example, a sample survey, then the code applies only to the registered
data. If only estimated data are
presented, the symbol (..) is shown instead of the quality code. For more information about the quality
of vital statistics data in general, and the information available on the basis
of the completeness estimates in particular, see section 4.2 of the Technical
Notes.
Limitations: Statistics on live births are subject to
the same qualifications as have been set forth for vital statistics in general
and birth statistics in particular as discussed in section 4 of the Technical
Notes.
The
reliability of data, an indication of which is described above, is an important
factor in considering the limitations.
In addition, some live birth are tabulated by date of registration and
not by date of occurrence; these have been indicated by a (+). Whenever the lag between the date of
occurrence and date of registration is prolonged and, therefore, a large
proportion of the live-birth registrations are delayed, birth statistics for any
given year may be seriously affected.
Another
factor which limits international comparability is the practice of some
countries or areas not to include in live-birth statistics infants who were born
alive but died before the registration of the birth or within the first 24 hours
of life, thus underestimating the total number of life births. Statistics of this type are
footnoted.
In
addition, the sex distribution of births may be especially affected by the
degree of incompleteness of birth registration. This is so because in some cultures it
appears that female births tend to be less completely registered than male
births, especially if the infant dies shortly after birth and before
registration.
The
comparability of data by urban/rural residence is affected by the national
definition of urban and rural used in tabulating these data. It is assumed, in the absence of
specific information to the contrary, that the definitions of urban and rural
used in connection with the national population census were also used in the
compilation of the vital statistics for each country or area. However, the possibility cannot be
excluded that, for a given country or area, the same definitions of urban and
rural are not used for both the vital statistics data and the population census
data. The definitions of urban vary
considerably from one area or country to another.
Coverage:
Live births are shown for 191 countries or areas. Data are presented by urban/rural
residence for 93 countries or areas.
Earlier
data: Live births have been shown in each issue of the Demographic Yearbook. For
information on specific years covered, readers should consult the Index.
[1] Principles and Recommendations for a Vital Statistics System Revision 2, Para.57, Sales No. E.01.XVII10, United Nations, 2001