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早产约占所有分娩的5%～15%,近年有上升趋势。早产是围生儿死亡的主要原因之一[1]。75%的围生儿死亡与早产有关。约有25%存活的早产儿并发不同程度的智力障碍及神经系统后遗症。因此,防止早产是降低围生儿死亡率和患病率的关键。
Preterm birth accounts for about 5% to 15% of all births and there is an upward trend in recent years. Premature labor is one of the major causes of perinatal death [1]. 75% of perinatal deaths are associated with preterm birth. Approximately 25% of surviving preterm infants have varying degrees of mental retardation and neurological sequelae. Therefore, preventing premature birth is the key to reducing perinatal mortality and morbidity.