Related Experiment Video
Updated: Mar 14, 2026

04:18
Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
Published on: October 10, 2025
637
Births in the United States, 2015
NCHS Data Brief
|September 21, 2016
Summary
In 2015, U.S. births declined slightly, with fertility rates dropping to record lows for younger women but rising for older women. Cesarean delivery rates decreased while preterm birth rates saw a slight increase.
Area of Science:
- Demography
- Public Health
- Reproductive Health
Background:
- The U.S. experienced 3.978 million births in 2015, a slight decrease from the previous year.
- National Vital Statistics System data provides comprehensive birth information.
Purpose of the Study:
- To analyze key demographic and maternal/infant health indicators from 2015 final birth data.
- To present trends in general fertility rates, age-specific birth rates, cesarean delivery, and preterm birth rates.
Main Methods:
- Utilized final birth data from the National Vital Statistics System for 2015.
- Examined trends in general fertility rates (births per 1,000 women aged 15-44).
- Analyzed age-specific birth rates, cesarean delivery rates, and preterm birth rates.
Main Results:
- The U.S. general fertility rate decreased by 1% in 2015.
- Birth rates reached record lows for women under 30, while increasing for women aged 30-44.
- The cesarean delivery rate declined to 32.0%, and the preterm birth rate slightly increased to 9.63%.
Conclusions:
- 2015 data indicates shifting fertility patterns across age groups.
- While cesarean rates decreased, preterm birth rates showed a slight rise, highlighting ongoing maternal and infant health considerations.
Related Concept Videos
Population Growth
29.4K
Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
29.4K
Birth Control Methods
7.1K
Vasectomy is a surgical form of male sterilization that involves severing and sealing the vasa deferentia, preventing sperm from mixing with semen during ejaculation. Because a vasectomy does not impact the testes' ability to produce testosterone, hormone levels, libido, and sexual function generally remain unchanged. While vasectomy is highly effective in preventing pregnancy, with a success rate near 99.85%, rare cases of recanalization (spontaneous reconnection) can occur. Although...
7.1K
Fetal Circulation
4.1K
Fetal circulation is a unique system that facilitates the exchange of gases, nutrients, and waste products between the developing fetus and the mother. This intricate process takes place through a special organ called the placenta.
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
4.1K
Prevalence and Incidence
2.2K
In statistical epidemiology and health sciences, two essential metrics—prevalence and incidence—are fundamental for understanding disease dynamics within a population. These measures enable public health officials, epidemiologists, and researchers to assess the burden of diseases, allocate resources effectively, and design impactful public health policies and interventions.
Prevalence indicates the proportion of individuals in a population who have a specific disease or health...
Prevalence indicates the proportion of individuals in a population who have a specific disease or health...
2.2K
Applications of Life Tables
396
Life tables are versatile across various fields, providing a quantitative basis for analyzing mortality and survival rates. Whether used by demographers, actuaries, epidemiologists, or sociologists, life tables offer valuable insights into the dynamics of life and death, facilitating informed decisions in public health, insurance, conservation, and beyond. Their broad applicability highlights the interconnectedness of demographic data with practical outcomes in everyday life and strategic...
396
Life Tables
603
A life table is a statistical tool that summarizes the mortality and survival patterns of a population, providing detailed insights into the likelihood of survival or death across different age intervals within a cohort. By organizing data on survival probabilities and mortality rates, life tables offer a clear snapshot of population dynamics over time. They are extensively used in demography, public health, actuarial science, and ecology to analyze life expectancy, design health interventions,...
603

