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Related Concept Videos

Prevalence and Incidence01:08

Prevalence and Incidence

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 condition at a...
Teratogenicity01:07

Teratogenicity

The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
Relative Risk01:12

Relative Risk

Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
Mitral Valve Prolapse III: Nursing Management01:19

Mitral Valve Prolapse III: Nursing Management

The nursing management of Mitral Valve Prolapse, or MVP, centers around patient education, symptom monitoring, and lifestyle modifications.Patient Education on MVP Diagnosis and Heredity: Nurses should provide comprehensive education about MVP, a condition where the mitral valve does not close appropriately during heartbeats. This education often includes the condition's pathophysiology, symptoms, and potential complications, like arrhythmias or mitral regurgitation. Though not fully...
Development of the Oral Microbiota01:28

Development of the Oral Microbiota

The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
Pathophysiology of Diabetes01:20

Pathophysiology of Diabetes

Diabetes mellitus is a chronic metabolic disorder characterized by hyperglycemia. The four categories of diabetes are type 1 diabetes, type 2 diabetes, other specific types of diabetes, and gestational diabetes.
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Related Experiment Video

Updated: Jul 14, 2026

Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice
04:18

Modeling Ascending Vaginal Infection, Preterm Birth, and Neonatal Morbidity in Mice

Published on: October 10, 2025

Recurrence risk for preterm delivery.

Julie McManemy1, Erinn Cooke, Erol Amon

  • 1Department of Pediatrics, Division of Emergency Medicine, Washington University School of Medicine, St Louis, MO, USA.

American Journal of Obstetrics and Gynecology
|June 6, 2007
PubMed
Summary

The risk of preterm birth recurrence in a third birth is significantly influenced by previous preterm delivery history. Factors like frequency, order, and severity of prior preterm births impact this risk.

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatal Epidemiology
  • Reproductive Health

Background:

  • Preterm birth remains a leading cause of neonatal morbidity and mortality.
  • Understanding recurrence risk is crucial for clinical management and public health strategies.
  • Previous studies have indicated a higher risk of preterm birth recurrence, but detailed analysis by prior delivery characteristics is needed.

Purpose of the Study:

  • To estimate the recurrence risk of preterm delivery in women experiencing a third birth.
  • To analyze how the characteristics of previous preterm births influence the risk of recurrence.

Main Methods:

  • Population-based cohort study utilizing Missouri birth records from 1989-1997.
  • Inclusion of mothers with three consecutive singleton live births.
  • Calculation of recurrence risk stratified by prior preterm delivery status and adjusted using Mantel-Haenszel analysis.

Main Results:

  • The study analyzed 19,025 third births.
  • Recurrence risk varied significantly: 42% for two prior preterm deliveries, 21% (term/preterm), 13% (preterm/term), and 5% (term/term).
  • Highest recurrence risk (57%) observed with two prior very preterm deliveries (21-31 weeks); lowest (33%) with two moderate preterm deliveries (32-36 weeks).

Conclusions:

  • Prior preterm delivery history strongly predicts recurrence risk in subsequent births.
  • The frequency, order, and severity of previous preterm births are significant factors modifying recurrence risk.
  • These findings underscore the importance of detailed obstetric history in assessing and managing preterm birth risk.