Comparison of Neonatal and Infant Mortality Rates between Infants Born in South Korea and Those Born in the United States
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Purpose: The neonatal (NMR) or infant mortality rate (IMR) in South Korea is lowerthan that in the United States. We aimed to investigate the contributing factors to thisdifference in mortality rates. Methods: The study populations consisted of five groups, namely group A, comprisinglive births in South Korea during 2009–2011 (n=1,383,806), and groups B (live births toKorean parents, n=107,309), C (Caucasian births, n=31,588,183), D (African-origin,n=4,381,664), and E (all live births, n=49,384,187) comprising various US live birthsduring 2000–2011. Maternal characteristics, birth outcomes, and mortality rates inthese five groups were compared according to birth weight (BW) and gestational age(GA). Results: Maternal characteristics such as BW distribution and very low and low BWrates among infants in South Korea and those in the United States were quite similar. Both rates were significantly lower among the Korean live births than amongCaucasian and African-origin live births in the United States. However, the mortalityrates of these small birth weight groups were significantly higher in the Korean infantsborn in South Korea than in those born in the United States, or in Caucasian andAfrican-origin infants born in the United States. Similar results were noted whenanalyzed according to gestational age. Conclusion: The NMR or IMR in South Korea is lower than that in the United States,primarily due to the overwhelming favorable BW and GA distribution, despite thelower BW- and GA-specific survival rates in the live births in South Korea than in theUnited States.
Abstract
Purpose: The neonatal (NMR) or infant mortality rate (IMR) in South Korea is lowerthan that in the United States. We aimed to investigate the contributing factors to thisdifference in mortality rates. Methods: The study populations consisted of five groups, namely group A, comprisinglive births in South Korea during 2009–2011 (n=1,383,806), and groups B (live births toKorean parents, n=107,309), C (Caucasian births, n=31,588,183), D (African-origin,n=4,381,664), and E (all live births, n=49,384,187) comprising various US live birthsduring 2000–2011. Maternal characteristics, birth outcomes, and mortality rates inthese five groups were compared according to birth weight (BW) and gestational age(GA). Results: Maternal characteristics such as BW distribution and very low and low BWrates among infants in South Korea and those in the United States were quite similar. Both rates were significantly lower among the Korean live births than amongCaucasian and African-origin live births in the United States. However, the mortalityrates of these small birth weight groups were significantly higher in the Korean infantsborn in South Korea than in those born in the United States, or in Caucasian andAfrican-origin infants born in the United States. Similar results were noted whenanalyzed according to gestational age. Conclusion: The NMR or IMR in South Korea is lower than that in the United States,primarily due to the overwhelming favorable BW and GA distribution, despite thelower BW- and GA-specific survival rates in the live births in South Korea than in theUnited States.
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