Community Profiles

DEFINITIONS, RATES AND RATIOS

DEFINITIONS

BIRTHWEIGHT – Weight of fetus or infant at time of delivery.

DISCHARGE – The formal relase of a patient by a hospital; that is, the termination of a period of hospitalization by death or by disposition to place of residence, nursing home, or another hospital.

FETAL DEATH – Death prior to the complete expulsion or extraction from its mother of a product of conception, having passed through at least the 20th week of gestation or weighing at least 400 grams; the fetus shows no signs of life such as beating of the heart, pulsation of the umbilical cord, or definite movement of voluntary muscles. (Note: This does not include induced terminations.)

FIRST BIRTH – A live birth where the maternal medical history indicates there were no prior live births to the mother.

GESTATIONAL PERIOD – Number of completed weeks elapsed between the first day of the last menstrual period and the date of delivery.

HEBDOMADAL DEATH – Deaths occurring to individuals less than 7 days of age.

INFANT DEATH – Deaths occurring to individuals less than 1 year of age.

INTERPREGNANCY TIME PERIOD – Birth date (in months) minus the date of the last termination, whether it was a live birth or fetal death. Time periods of zero length are dropped to exclude 2nd or higher births of multiple deliveries.

LEADING CAUSES OF DEATH – Deaths are grouped into 72 categories dependent upon the underlying cause of death. Ranks are assigned by organizing these categories according to the number of deaths in each category from most frequent to least.

LIVE BIRTH – A live birth is 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 movement of voluntary muscles. Effective on November 9, 1981, the definition of a live birth is established in administrative rule number 325.3201 as follows:

“Live birth ” means the complete expulsion or extraction from a pregnant woman of a product of human conception which, after such expulsion or extraction, shows any evidence of life, whether or not the umbilical cord has been cut or the placenta is attached.

LOW BIRTHWEIGHT – Births in 1984 or later wherein the birthweight is less than 2,500 grams (approximately 5 lbs., 8 oz.) or births before 1984 wherein the birthweight is 2,500 grams or less.

NEONATAL DEATH – Deaths occurring to individuals less than 28 days of age.

PERINATAL DEATH – Fetal deaths plus deaths to individuals less than 7 days of age.

POSTNEONATAL DEATH – Deaths occurring to individuals 28–364 days of age.

RACE – Race for mother, father, or decedent is as stated on certificate. Race of child is determined from the race of the parents.

RESIDENCE – Usual place of residence for the person to whom the event occurred. For births and fetal deaths, residence is defined as the mother's usual place of residence.

TOTAL BIRTHS – Live births plus fetal deaths.

UNDERLYING CAUSE OF DEATH – That condition giving rise to the chain of events leading to death.

VERY LOW BIRTHWEIGHT – Births in 1984 or later wherein the birthweight is less than 1,500 grams (approximately 3 lbs., 4 oz.) or births before 1984 wherein the birthweight is 1,500 grams or less.

RATES AND RATIOS

AGE–ADJUSTED DEATH RATE – A summary rate of death that is developed using a standard population distribution to improve the comparability of rates for areas or population subgroups with differing age distributions. When calculated by the direct method, as in this report, age–specific death rates for a geographic area or population subgroup are multiplied by the standard population per specific age and the products summed and divided by the total standard population. Age–adjusted death rates represent the mortality experience that would have occurred in a standard population had the age–specific rates of the area or population subgroup been experienced by the standard population. These rates are presented as per 100,000 population.

AGE–SPECIFIC BIRTH RATE – Number of resident live births to women of a specific age divided by total resident female population of specific age x 1,000.

AGE–SPECIFIC DEATH RATE – Number of resident deaths in specific age group divided by total resident population in specific age group x 100,000.

AGE–SPECIFIC DEATH RATE BY CAUSE OF DEATH – Number of resident deaths in specific age group and from a specific cause divided by total resident population in specific age group x 100,000.

AGE–SPECIFIC MARRIAGE RATE – Number of occurrence marriages in specific age group by sex divided by total resident population in specific age and sex group x 1,000.

CAUSE–SPECIFIC RATE – Number of resident deaths due to a specific cause divided by total resident population x 100,000.

CRUDE BIRTH RATE – Number of resident live births divided by total resident population x 1,000.

CRUDE DEATH RATE – Number of resident deaths divided by total resident population x 1,000.

DISCHARGE RATE – Number of resident discharges divided by total resident population x 100,000.

DIVORCE RATE – Number of persons with occurrence divorces and annulments divided by total resident population x 1,000.

FETAL DEATH RATE – Number of resident fetal deaths divided by total resident live births plus resident fetal deaths x 1,000.

FETAL DEATH RATIO – Number of resident fetal deaths divided by total resident live births x 1,000.

INFANT MORTALITY RATE – Number of resident infant deaths divided by total resident live births x 1,000.

LOW BIRTHWEIGHT RATIO – Number of resident low birthweight live births divided by total resident live births x 1,000.

MARRIAGE RATE – Number of persons with occurrence marriages divided by total resident population x 1,000.

NEONATAL DEATH RATE – Number of resident neonatal deaths divided by total resident live births x 1,000.

PERINATAL DEATH RATE – Number of perinatal deaths divided by total resident live births plus resident fetal deaths x 1,000.

POSTNEONATAL DEATH RATE – Number of resident postneonatal deaths divided by total resident live births x 1,000.

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