When the numerator is sub-set by mother's race, location, or year of birth, then the same sub-set for race, location and year applies to the denominator population.

Totals, Multiple Births

Total number of births by gender and what type of birth it was: single, twins, triplets, quadruplets or higher.

Mother's Age and Marital Status

Number of individual mothers by their age in 5 year intervals between 15-54. It also considers mothers above and below that age group, and further classifies their marital status.

Mother's Race or Hispanic Origin

Mothers by their race: American Indian, Alaskan Native, Asian, Pacific Islander, Black or African American, Central or South American, Cuban, Hispanic, Mexican, White, Puerto Rican, other combinations and unstated.

Birthweight, Gestation, Prenatal Care

Weight of the baby when it is born. This dataset has birthweights in grams. Use this calculator to convert into pounds and ounces. 

Gestational Period

Range of weeks that represents the duration of the pregnancy at the time of birth. It is grouped by different intervals and by individual weeks as well. Usual gestation period for a normal birth is 38-42 weeks, according to the National Institutes of Health.

Prenatal Care

Type of preventive healthcare with the goal of providing regular check-ups that allow doctors or midwives to treat and prevent potential health problems throughout the course of the pregnancy while promoting healthy lifestyles that benefit both mother and child. This variable states if and when prenatal care began.

Mother's Age or Education

Mother’s education by education type and years of education, while also accounting for the Mother’s age by different intervals.

Mother's Race or Hispanic Origin and Age

Race and age of each mother.