Group prenatal care cut preterm birth 33 percent in African-American women. How to ask for CenteringPregnancy.

A 2007 randomized trial of 1,047 pregnant women, most of them African-American, found that group prenatal care cut preterm birth by 33 percent compared with individual visits (Ickovics et al., Obstetrics and Gynecology, PMID 17666608; adjusted odds ratio 0.67, 95% CI 0.44 to 0.99, P=.045). In the African-American subgroup, the preterm rate dropped from 15.8 percent in standard care to 10.0 percent in group care (aOR 0.59, 95% CI 0.38 to 0.92).

That finding matters because Black mothers are dying at 50.3 deaths per 100,000 live births, compared with 14.5 for white mothers, according to the most recent NCHS brief by Donna Hoyert, published February 2025. Preterm birth is one of the strongest drivers of infant mortality and long-term health gaps, and it is one of the few pregnancy outcomes where a specific, named prenatal model has produced a large, replicable reduction in Black women.

CenteringPregnancy is the most widely implemented group model in the United States. The Centering Healthcare Institute describes it as 10 visits, 90 minutes to two hours each, with 8 to 10 patients who are all due around the same time. Patients take their own blood pressure and weight, get a brief one-on-one check with the clinician, and then spend most of the visit in a facilitated group discussion covering nutrition, labor prep, breastfeeding, and postpartum recovery.

That structure is what drives the outcome difference. A standard prenatal visit runs about 15 minutes and is dominated by the physical exam. The Ickovics trial logged about 20 hours of contact time across the pregnancy in the group arm, compared with roughly two hours in the individual arm, and the group arm showed higher prenatal knowledge scores, higher labor readiness scores, higher patient satisfaction scores, and a breastfeeding initiation rate of 66.5 percent versus 54.6 percent in standard care (all P<.001, PMID 17666608).

A lot of obstetric research cites effect sizes from mostly-white study populations and then applies them to Black patients without comment. The Ickovics trial is different. It was conducted at two university-affiliated hospital clinics in the Northeast, and 80 percent of the 1,047 enrolled patients were African-American. The subgroup analysis was pre-specified. The African-American arm showed a preterm rate of 10.0 percent in group care versus 15.8 percent in standard care, aOR 0.59, 95% CI 0.38 to 0.92, P=.02. That is one of the few high-quality randomized effect sizes in modern obstetrics that was measured in Black women first, not extrapolated to them.

The study did not find a difference in mean birth weight or in prenatal-care cost, which is relevant for clinics weighing whether to stand up a Centering site. The gain is in the preterm rate and in measures of patient engagement, not in a bigger baby.

If you are pregnant or planning a pregnancy and you want group prenatal care, the fastest path is to call the OB clinic you already use and ask three questions. One: does the clinic offer CenteringPregnancy or any other structured group prenatal program? Two: if yes, at what gestational week does enrollment start, and are there still slots in a group that matches your due date? Three: if no, can the clinic refer you to a nearby site that runs it?

If the clinic does not offer group care and cannot refer you, use the site locator at centeringhealthcare.org to find a participating practice near you. Roughly 600 clinical sites run the program, concentrated in community health centers, academic medical centers, and federally qualified health centers. Medicaid covers CenteringPregnancy in most states on the same terms as standard prenatal care, because the billing codes are the same.

Clinics that do not run group care often cite space constraints or staffing. Two counter-points to have ready. First, the Ickovics trial found no added cost per pregnancy, so the financial argument is thin. Second, the American College of Obstetricians and Gynecologists has endorsed group prenatal care as an acceptable alternative to individual visits for patients who want it. If your clinic still declines, you have a real answer: the clinic has made a workflow choice, and you can take that information to a different practice or to the site locator above.

For patients who stay in individual prenatal care, two data points from this trial still travel. Patients who scored higher on prenatal knowledge had better outcomes, and patients who went in with labor-readiness preparation reported better birth experiences. Ask your clinic what structured prenatal education they offer, whether there is a doula program, and whether a community health worker is attached to the practice. Those are the pieces of group care you can replicate even when group visits are not on the menu.