Table of Contents
Advances in Epidemiology
Volume 2015 (2015), Article ID 858274, 6 pages
Research Article

Survival of Preterm Singleton Deliveries: A Population-Based Retrospective Study

1Department of Biostatistics, Robert Stempel College of Public Health & Social Work, Florida International University, 11200 SW 8th Street, AHC5 465, Miami, FL 33199, USA
2School of Dentistry, University of Louisville, 501 S. Preston Street, Louisville, KY 40202, USA
3Department of Family and Community Medicine, Baylor College of Medicine, 3701 Kirby Drive, Suite 600, Houston, TX 77098, USA

Received 15 May 2015; Revised 8 August 2015; Accepted 8 September 2015

Academic Editor: Peter N. Lee

Copyright © 2015 Boubakari Ibrahimou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Aim. To identify sociodemographic and medical characteristics associated with preterm birth survival. Methods. A retrospective study of singleton births was performed using Missouri linked data for the years 1978 to 2005. We computed hazard ratios (HR) and 95% confidence intervals (CI) using Cox proportional hazards model. Results. High rates of infant, neonatal, and postneonatal mortality were observed among preterm as compared to term births. White are at low risk for postneonatal (HR = 0.77, CI: 0.65, 0.90) and infant mortality (HR = 0.90, CI: 0.81, 0.99) compared to blacks. We observed increased risks of all mortality types for preterm deliveries by caesarean section (neonatal HR = 1.53, CI: 1.40, 1.68; postneonatal HR = 1.39, CI: 1.22, 1.58; infant HR = 1.37, CI: 1.27, 1.48). As compared to nonsmokers, preterm singletons born to smoking mothers are 69% more likely to experience postneonatal mortality and have a 17% increased risk for infant death. Conclusions. Caesarean section is associated with increased risk of all types of mortality. Racial disparity is still a concern. Further research is required to identify the detailed differences in structure and procedures that result in the disadvantage associated with preterm birth especially with respect to caesarean section and race.