Intrauterine infection is a major cause of preterm delivery.

宫内感染是早产发生的重要原因.

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Estimates of risk for low birth weight were similar to those for preterm delivery.

据估计,初生婴儿体重过轻的几率与早产的发生率相似.

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Premature rupture of membranes occurred in four cases ( 7.7 % ), and preterm delivery in 20 ( 38.4 % ).

4名患者 ( 7.7% ) 发生胎膜早破,20例患者发生早产 ( 38.4% ).

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