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任何孕龄的低出生体重婴儿都有较高的发病率和死亡率。然而,目前尚不知道是否有一个引起发病率和死亡率明显增加的阈值体重,该阈值是否随孕龄而变化。在美国每年大约有250 000例婴儿出生体重<2 500 g,其中大多数为早产儿,但约有40 000例为宫内生长迟缓的足月儿。本研究目的就是确定引起早产儿和足月儿不良结果显著增加的出生体重阈值。 1988年1月1日～1996年8月31日期间总共有126 680例妇女在达拉斯的Park-land医院分娩,将其中孕龄≥24周无畸形的
Low birth weight infants of any gestational age have higher morbidity and mortality. However, it is not yet known if there is a threshold weight that causes a significant increase in morbidity and mortality, and whether the threshold varies with gestational age. In the United States, there are approximately 250 000 babies born each year weighing <2500 g, the majority of whom are premature babies, but about 40 000 are full-term babies with intrauterine growth retardation. The aim of this study was to identify birth weight thresholds that caused a significant increase in adverse outcomes in preterm and term infants. A total of 126 680 women were delivered at Park-land Hospital, Dallas, from January 1, 1988 to August 31, 1996, with no malformations at gestational age ≥24 weeks