The Relation between the Availability of Neonatal Intensive Care and Neonatal Mortality
David C. Goodman, M.D., Elliott S. Fisher, M.D., George A. Little, M.D., Thérèse A. Stukel, Ph.D., Chiang-hua Chang, M.S., and Kenneth S. Schoendorf, M.D.
Background There is marked regional variation in the availabilityof neonatal intensive care in the United States. We conducteda study to determine whether a greater supply of neonatologistsor neonatal intensive care beds is associated with lower neonatalmortality.
Methods We used the 1996 master files of the American MedicalAssociation and the American Osteopathic Association and 1998and 1999 surveys of neonatal intensive care units to calculatethe supply of neonatologists and neonatal intensive care bedsin 246 neonatal intensive care regions. We used linked birthand death records from the 1995 U.S. birth cohort to assessassociations between the supply of both neonatologists and neonatalintensive care beds per capita (in quintiles) and the risk ofdeath within the first 27 days of life.
Results Among 3,892,208 newborns with a birth weight of 500g or greater, the mortality rate was 3.4 per 1000 births. Afteradjustment for neonatal and maternal characteristics associatedwith an increased risk of neonatal death, the rate was lowerin the regions with 4.3 neonatologists per 10,000 births thanin those with 2.7 neonatologists per 10,000 births (odds ratiofor death, 0.93; 95 percent confidence interval, 0.88 to 0.99).Further increases in the number of neonatologists were not associatedwith greater reductions in the risk of death. There was no consistentrelation between the number of neonatal intensive care bedsand neonatal mortality.
Conclusions A minority of regions in the United States may haveinadequate neonatal intensive care resources, whereas many othersmay have more resources than are needed to prevent the deathof high-risk newborns. The effect of the availability of neonatologistson other health outcomes is not known.
Source Information
From the Departments of Pediatrics (D.C.G., G.A.L.), Medicine (E.S.F.), and Community and Family Medicine (D.C.G., E.S.F., T.A.S., C.C.) and the Center for the Evaluative Clinical Sciences (D.C.G., E.S.F., T.A.S., C.C.), Dartmouth Medical School, Hanover, N.H.; the Veterans Affairs Outcomes Group, White River Junction, Vt. (E.S.F.); and the National Center for Health Statistics, Hyattsville, Md. (K.S.S.).
Address reprint requests to Dr. Goodman at 7251 Strasenburgh Hall, Dartmouth Medical School, Hanover, NH 03755, or at david.goodman{at}dartmouth.edu.
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