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Published on: January 12, 2018
Group Prenatal Care Reduces Risk of Preterm Birth and Low Birth Weight: A Matched Cohort Study
Shayna D Cunningham1, Jessica B Lewis1, Fatma M Shebl1
11 Yale School of Public Health, New Haven, Connecticut.
Insights
Group prenatal care significantly reduces the risk of preterm birth and low birth weight. Increased participation in group prenatal care (≥5 visits) further enhances these positive birth outcomes.
Area of Science:
- Maternal-Fetal Medicine
- Public Health
- Healthcare Delivery Models
Background:
- Group prenatal care is a recognized strategy for improving perinatal outcomes.
- Research gaps exist regarding its effectiveness in diverse populations and the impact of patient adherence.
- This study investigates group prenatal care's effect on preterm birth and low birth weight, considering adherence.
Purpose of the Study:
- To evaluate the impact of group prenatal care on preterm birth and low birth weight.
- To analyze outcomes in a large, metropolitan hospital setting over an 8.5-year period.
- To account for patient adherence in assessing the effectiveness of group prenatal care.
Main Methods:
- Analysis of data from 9,348 women with live, singleton births from January 2009 to June 2016.
- Comparison of group (CenteringPregnancy, Expect With Me) versus individual prenatal care.
- Propensity score matching and Poisson regression to estimate risks of preterm birth and low birth weight.
Main Results:
- Group prenatal care was associated with a significantly lower risk of preterm birth (RR 0.63) and low birth weight (RR 0.62) compared to individual care.
- Women attending ≥5 group prenatal care visits showed substantially greater risk reductions: 68% for preterm birth and 66% for low birth weight.
- These findings were adjusted for individual visit frequency.
Conclusions:
- Group prenatal care participation is linked to improved birth outcomes.
- Health systems should consider promoting the adoption and sustainability of group prenatal care models.
- Further research may explore optimal adherence levels and diverse population impacts.
Background:
Group prenatal care is a promising strategy to improve perinatal outcomes. Research in larger more diverse populations with attention to adherence is needed to inform clinical practice recommendations. We examined the impact of group prenatal care on preterm birth and low birth weight in a large metropolitan hospital, accounting for patient adherence, over an 8.5-year period.
Materials And Methods:
We analyzed data from 9,348 pregnant women with a live, singleton birth who received group (CenteringPregnancy or Expect With Me) or individual prenatal care at Vanderbilt University Medical Center from January 2009 through June 2016. Propensity scores were used for matching based on year of delivery, age, race, pregnancy risk, and adequacy of care. The propensity score matched sample included 1,384 group and 5,055 individual prenatal care patients (total = 6,439 women). Preterm birth (<37 weeks gestation) and low birth weight (<2,500 g) were obtained from systematic medical review. Risks were estimated using Poisson regression.
Results:
Controlling for individual visits, receiving group prenatal care resulted in significantly lower risk of having a preterm birth (Rate ratio [RR] 0.63, 95% confidence interval [CI] 0.49-0.81) and low birth weight baby (RR 0.62, 95% CI 0.47-0.81), compared to receiving individual care only. Women with ≥5 group prenatal care visits experienced even greater benefits: 68% (RR = 0.32; 95% CI 0.22-0.45) and 66% (RR = 0.34; 95% CI 0.23-0.50) risk reduction in preterm birth and low birth weight, respectively.
Conclusions:
Participation in group prenatal care may improve birth outcomes. Efforts to promote adoption and sustainability of group prenatal care by health systems may be warranted.
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