Obstetrical unit closures and racial and ethnic differences in severe maternal morbidity in the state of New Jersey

In the United States, racial disparities in maternal morbidity and mortality are pronounced and persistent. Although the maternal mortality ratio and the severe maternal morbidity rates have increased over the past 30 years, the number of obstetrical units in the country has simultaneously diminished. Black women are 3 times more likely to die during childbirth than White women and twice as likely to suffer severe maternal morbidity (or a near miss). Between 2003 and 2013, 366 (10%) obstetrical units closed, and rural obstetrical unit closures were more likely in the Black communities. The state of New Jersey has the highest Black maternal mortality rate (131.8/100,000 live births) of all states reporting these data. Very few studies have examined the role that urban obstetrical unit closures play in racial and ethnic disparities in maternal health outcomes.

To analyze racial differences in severe maternal morbidity in New Jersey hospitals among women experiencing the loss of their nearest obstetrical unit during the years 2006-2015.

This study used data on all births in New Jersey hospitals (2006-2015) by women living in ZIP code tabulation areas that lost their nearest obstetrical unit during that period. Severe maternal morbidity was measured using a composite variable for severe illness during hospitalizations (eg, acute heart failure, acute renal disease, disseminated intravascular coagulation, sepsis) identified using the International Classification of Diseases, Ninth Revision. Logistic regression models were used to analyze the associations between race and ethnicity on the individual likelihood of severe maternal morbidity, adjusting for annual trends, individual socioeconomic characteristics, age, preexisting conditions, and delivery hospital characteristics (ie, percentage of Black patients >25% [Black-serving hospital] and percentage of Medicaid discharges in the delivery obstetrical unit).

There were 227,412 delivery hospitalizations among women who lived in the 124 New Jersey ZIP code tabulation areas that lost the nearest obstetrical unit from 2006 to 2015. Black women had the highest severe maternal morbidity rates, increasing from 1.2% in 2006 to 2.3% in 2015. The Black-White gap remained similar in magnitude over the period, as White women's severe maternal morbidity rates increased from 0.7% to 1.4%. However, for Hispanic women, the severe maternal morbidity increased dramatically from 0.7% in 2006 to 2.4% in 2013, followed by a decreasing trend during 2013-2015. When adjusting for individual factors, the odds of severe maternal morbidity among all women was greater if they delivered after the loss of the nearest obstetrical unit (adjusted odds ratio, 1.55; 95% confidence interval, 1.30-1.86). Hispanic women experienced the greatest increase in severe maternal morbidity, regardless of whether they delivered before or after the closure of their nearest obstetrical unit. For all women, delivering in a Black-serving obstetrical unit was associated with a greater likelihood of individual severe maternal morbidity (adjusted odds ratio, 1.36; 95% confidence interval, 1.19-1.56).

Racial and ethnic disparities in severe maternal morbidity persist and might be exacerbated by nearby obstetrical unit closures. In New Jersey ZIP codes with obstetrical unit loss, the Hispanic-White gap in the severe maternal morbidity widened substantially, and the rates were also higher among women who delivered in Black-serving hospitals. Policymakers should take steps to prevent obstetrical unit closures and to ensure that the resources available at Black-serving obstetrical units are at least on par with those of other institutions.