Abortion: See Induced termination of pregnancy (induced
abortion) and specific procedures: chemical induction, dilation and evacuation,
hysterotomy, vacuum aspiration.
ACME: Automated Classification of Medical Entities. (See also
Automated Classification of Medical Entities.)
Adjusted rate: A rate that has taken into account influences on
a crude rate, such as differences in age composition of the population.
Age-specific rate: "Rate obtained for specific age groups (for
example, age-specific fertility rate, death rate, marriage rate, illiteracy
rate, school enrollment rate, etc)." 1
AIDS: Acquired Immune Deficiency Syndrome caused by the Human
Immunodeficiency Virus (HIV).
Annulment: The legal dissolution of a marriage in which the
union is voided (declared as having never occurred). "A suit for annulment
presumes that there never was a valid marriage and that it should be declared
void, whereas a suit for divorce presumes a valid marriage but asks that the
relationship be dissolved for postnuptual causes." 2 (See also
Automated Classification of Medical Entities (ACME): Computer
program developed by the National Center for Health Statistics that assigns one
underlying cause of death based on full medical information and multiple causes
of death listed on the death certificate.
Birth weight: The weight of an infant at delivery, recorded in
pounds and ounces or in grams.
Bureau of Vital Statistics (BVS), The: "The office within the
Texas Department of Health charged with the implementation of the Texas Vital
Statistics Law." (See also Texas Vital Statistics Law.) Functions within the
Bureau include "the registration, preparation, transcription, collection,
compilation, and preservation of data pertaining to births, adoptions,
legitimations, deaths, stillbirths, marital status, and data incidental
Cause of death: Any condition which leads to or contributes to
death and is classifiable according to the tenth revision of The
International Classification of Diseases (ICD-10).
Chemical induction: The process of causing an abortion by using
Childbearing years: The reproductive age span of women;
conventionally defined as 15 through 44 years of age for the U.S. population.
CNM: Certified Nurse-Midwife.
Cohort: A group of individuals sharing a common demographic
experience with respect to an observed period of time (e.g., individuals sharing
the same birth year or years, individuals who fall in a specified age range.)
Confidence interval: The range of values that has a probability
x of including the true value for the population. A 95% confidence interval
includes the true value for the population 95% of the time.
Congenital anomaly: Physical, physiological, or metabolic
abnormality existing before or at birth, but not necessarily detectable at
COPD: Chronic obstructive pulmonary diseases and allied
conditions (replaced, as a leading cause, in ICD-10 by chronic lower respiratory
diseases, codes J40 through J47).
Crude rate: The rate of any demographic or vital event that is
based on an entire population.
Demography: The study of populations including their size,
age-sex composition, distribution, density, growth, natality, mortality,
nuptiality, migration, and any other characteristics which may affect these
Dilation and evacuation: A surgical procedure that expands the
cervical canal of the uterus (dilation) so that the surface lining of the
uterine wall can be scraped (curettage).
Divorce: "Divorce is the final legal dissolution of a marriage,
that is, the separation of husband and wife by a judicial decree which confers
on the parties the right to civil and/or religious remarriage, according to the
laws of each country." 4 (See also Annulment.)
Ethnicity: The classification of a population that shares
common characteristics, such as, religion, traditions, culture, language, and
tribal or national origin.
External cause of death: Death caused by Accidents and Adverse
Effects (ICD-10 codes V02-X59,Y85-Y86), Suicide (X60-X84,Y87.0), Homicide and
Legal Intervention (X85-Y09,Y35,Y87.0,Y89.0), and other outside causes
Fertility: The actual reproductive performance of an
individual, couple or a population.
Fetal death (stillbirth): Death of a product of conception
prior to the complete expulsion or extraction from its mother, regardless of the
length of gestation. In Texas, fetal death registration is required only for
those cases with a gestation of 20 weeks or more.
General fertility rate (GFR): "The number of live births per
1,000 women age 15-44 years in a given year." 5
Gestation period: Number of completed weeks elapsed between the
first day of the last normal menstrual period and the date of delivery.
Homicide: Death due to injury purposefully inflicted by other
individuals (ICD-10 codes, X85-Y09,Y87.1), death from injuries resulting from
legal intervention (homicide committed by law enforcement officers; ICD-10
Hysterotomy: Evacuation of the pregnancy through incision of
ICD-10: The International Classification of Diseases,
10th edition. A system for classifying diseases and injuries developed by the
World Health Organization and used worldwide to improve comparability of cause
of death statistics reported from different countries. The tenth revision has
been in use since January 1, 1999.
Induced termination of pregnancy (induced abortion): Any act or
procedure performed after a pregnancy is medically verified with the intent to
cause the termination of an intra-uterine pregnancy other than for the purpose
of either the birth of a live infant or removing a dead fetus.
Infant: An individual less than one year of age.
Infant death: Death of an individual less than one year of age.
Infant deaths are further classified as neonatal deaths and postneonatal deaths.
(See also neonatal death and postneonatal death.)
In-migration: The process of moving into a geographic area for
the purpose of taking up residence.
Intrauterine Instillation: Injecting saline or prostaglandin
into the uterus to cause contractions, which expel the contents of the uterus.
Kessner Index: Method of categorizing adequacy of prenatal
care, based on month of pregnancy care started, number of visits, and length of
gestation. This index adjusts for the fact that women with short gestations have
less time in which to make prenatal care visits.
Life expectancy: The average number of years that a person can
anticipate living after a given age, usually birth. Most often based upon the
current mortality experience of a population.
Life table: Statistical tool typically used to portray
expectation of life at various ages. Also provides information on numbers of
individuals who survive to various ages, median age at death, age-specific death
rates, and the probability of dying at certain ages.
Live birth: The complete expulsion or extraction from its
mother of a product of conception, irrespective of the duration of the
pregnancy, which after such separation, breathes or shows any other evidence of
life such as beating of the heart, pulsation of umbilical cord, or definite
movement of voluntary muscles, whether or not the umbilical cord has been cut or
the placenta is attached.
Live birth order: The number of children born alive to a
mother, including the current child. Important in demography because the
probability of having an additional child is affected by the number of children
a woman has previously borne.
Low birth weight: A birth weight less than 2,500 grams or less
than 5 pounds, 9 ounces.
Malignant neoplasm: A tumor having the properties of invasion
Maternal death: The death of a woman resulting from pregnancy
or childbearing, while pregnant or within 42 days of termination of pregnancy.
MCDC: Multiple cause of death coding. (See also multiple
cause of death coding.)
Medical (Nonsurgical) Abortion: Administration of medications
for the purpose of inducing an abortion.
Mean: The arithmetic average of a set of values. It is
calculated as the sum of the values divided by the number of values.
Median: The value in an ordered set of values above and below
which there are an equal number of values; the 50th percentile.
Mode: The most frequent number in a set of numbers.
Morbidity: Refers to the occurrence of diseases in a
Mortality: Death as a component of population change.
Multiple causes of death: All diseases or injuries which led
directly to death, or all circumstances of the accident or violence which
produced the fatal injury.
Multiple cause of death coding (MCDC): Provides access to all
causes of death listed on the death certificate instead of a single assigned
underlying cause of death. Used by ACME for assigning underlying cause of death
from full medical information on death certificates. (See also Automated
Classification of Medical Entities.)
Natality: Birth as a component of population change.
Natural increase: The surplus or deficit of births relative to
deaths in a population in a given time period.
Neonatal death: Death of an infant less than 28 days of age.
Neonate: An infant less than 28 days of age.
Nosology: The division of the Bureau of Vital Statistics that
classifies, for statistical purposes, causes of deaths, based on the ICD-10; the
branch of medical science that deals with classification of diseases.
Occurrence, place of: Location where a vital event took place.
Occurrence data: Data compiled by the geographic place in which
the event occurred without regard to the place of residence of the individual(s)
involved in the event.
Out-migration: The process of permanently moving out of a
Perinatal: Period from 20 weeks gestation through 27 days after
Plurality: Classification of the number of children born of one
pregnancy. Designated as single, twin, triplet, quadruplet and so on.
Population: The total of all individuals in a given area.
Postneonatal death: Death of an infant at least 28 days of age
but less than one year of age.
Postneonate: An infant at least 28 days of age but less than
one year of age.
Preterm birth: Birth at less than 37 completed weeks of
Proportion: A portion of a population in relation to another
portion of the population or to the population as a whole. Proportions are a
special type of ratio in which the denominator always includes the numerator.
(See also ratio.)
Race: A geographical population of humankind that possesses
inherited distinctive physical characteristics that distinguish it from other
Range: The distance between the smallest and largest numbers in
a set of numbers.
Rate: The frequency of a demographic event in a specified
period of time divided by the population at risk of the event.
Ratio: The relation of one population subgroup to another
subgroup, or to the whole population. The denominator of a ratio may or may not
include the numerator. If the denominator includes the numerator, it is a
special type of ratio known as a proportion. (See also proportion.)
Remaining years of life: The expectation of life at any given
age; the average number of years remaining to be lived by those surviving to
Residence: The geographic area of the usual place of abode.
Residence data: Data compiled by the usual place of residence
without regard to the geographic place where the event occurred. For births and
fetal deaths, the mother's usual residence is used as the place of residence.
Self-identification: A method of race/ethnicity classification.
This classification is derived from information provided by the parents for a
birth certificate or by the informant who provided information for a death
Sharp Cutterage (dilation and curretage, D&C, or surgical
curretage): A surgical procedure in which the uterine contents are
removed with curette.
Standardized rate: See adjusted rate.
Statistical cut-off: Date by which records of vital events for
a specific year must be received in order to be included in the statistical
analyses for that year.
Statistical Significance: Used to evaluate the likelihood that
chance variability may be considered an explanation for observed results. An
appropriate mathematical test of statistical significance is calculated to
determine the p value, which is the probability that the observed results
may be due to chance alone. If the p value is less than an arbitrarily
chosen value, commonly selected as 0.05, the findings are accepted as
statistically significant at the 5 percent level. This indicates there is less
than 5 percent probability that the observed results are due to chance alone.
Suction Curettage (Vacuum Aspiration): Removal of uterine
contents through a flexible tube attached to a suction apparatus.
Texas Vital Statistics Law: Texas Health and Safety Code, Title
Underlying cause of death: The disease or injury which
initiated the train of morbid events leading directly to death, or the
circumstances of the accident or violence which produced the fatal injury.
Vacuum aspiration: Removal of uterine contents by using a
hollow curet or catheter to which a suction apparatus is attached.
Very low birth weight: A birth weight less than 1500 grams, or
less than 3 pounds, 5 ounces.
Vital event: An occurrence of birth, adoption, induced
abortion, marriage, divorce or death, "together with any change in civil status
which may occur during an individual's lifetime." 6
Vital statistics: Demographic data on abortions, births,
deaths, fetal deaths, marriages and divorces.
Years of potential life lost (YPLL): A measure of premature
mortality of Texas residents for individuals who die before age 65. "The sum of
the years of life lost annually by persons who suffered early deaths."
7 (See also Years of potential life lost,
1 Arthur Haupt and Thomas T. Kane, Population Handbook
(Washington, D.C.: Population Reference Bureau, Inc., 1978), p. 51.
2 Texas Jur, 3d ed. (San Francisco, California:
Bancroft-Whitney Co., 1985), p. 108.
3 Vital Statistics Manual for Local Registrars, 1989, p.
4 Henry S. Shryock, Jacob S. Siegel and Associates. Condensed
edition by Edward G. Stockwell, Studies in Population: The Methods and
Materials of Demography (New York: Academic Press, Inc., 1976), p. 40.
5 Haupt, et al, p. 54.
6 Funeral Directors' Handbook on Death Registration and Fetal
Death Reporting (Hyattsville, Maryland: National Center for Health
Statistics, 1987), p. 46.
7 "Premature Mortality in the United States: Public Health Issues
in the Use of Years of Potential Life Lost." Morbidity and Mortality Weekly
Report, 1986; 35: 2S, 1s-11s.
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