Extremely low birth weight and infant mortality rates in the United States.
نویسندگان
چکیده
OBJECTIVE Infant mortality rates (IMR) and neonatal mortality rates (NMR) in the United States have not decreased recently. The purpose of this study was to determine the contributions of birth weight and gestational age subgroups to the IMR and NMR in the United States. METHODS We used the most recent (1983-2005) US linked birth and infant death data and simple regression analysis to determine the contributions of specific birth weight and gestational age subgroups to trends in IMR and NMR. RESULTS IMR and NMR decreased between 1983 and 2005 for all birth weight and gestational age subgroups. There was an increase in births of very low birth weight infants from 1.2% to 1.5% (P < .001) over this period. The proportion of very low birth weight-infant deaths increased from 42.9% to 54.8%, resulting in recent nonsignificant declines in IMR and NMR. The proportion of live-birth infants <500 g increased from 0.12% to 0.18% (P < .001). The adjusted IMR and NMR over time (excluding infants <500 g) have steeper declining trends than the ones including infants <500 g. The changes in overall IMR and NMR in recent years (2000-2005) are not statistically significant. However, the adjusted IMR and NMR trends during this time are highly significant. CONCLUSIONS The increased proportions of infants <500 g and other low birth weight infants contribute greatly to the lack of a decrease in IMR and NMR from 2000 to 2005, although birth weight- and gestational age-specific IMR and NMR continue to decrease.
منابع مشابه
Extremely Low Birth Weight and Infant Mortality Rates in the United States
OBJECTIVE: Infant mortality rates (IMR) and neonatal mortality rates (NMR) in the United States have not decreased recently. The purpose of this study was to determine the contributions of birth weight and gestational age subgroups to the IMR and NMR in the United States. METHODS: We used the most recent (1983–2005) US linked birth and infant death data and simple regression analysis to determi...
متن کاملExtremely Low Birth Weight and Infant Mortality Rates in the United States
OBJECTIVE: Infant mortality rates (IMR) and neonatal mortality rates (NMR) in the United States have not decreased recently. The purpose of this study was to determine the contributions of birth weight and gestational age subgroups to the IMR and NMR in the United States. METHODS: We used the most recent (1983–2005) US linked birth and infant death data and simple regression analysis to determi...
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Low birth weight (LBW) and preterm birth are one the most important causes of death in the world and therefore are considered as one of the major health problems. Global statistics demonstrates an increase in the prevalence of low birth weight in the developing countries. Low birth weight infants are exposed to complications such as major neurosensory impairements, cerebral palsy, cognitive and...
متن کاملDifferences in perinatal and infant mortality in high-income countries: artifacts of birth registration or evidence of true differences?
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ورودعنوان ژورنال:
- Pediatrics
دوره 131 5 شماره
صفحات -
تاریخ انتشار 2013