Frequency of spontaneous preterm birth before 28 weeks in the current pregnancy based on previous history of spontaneous preterm birth

	Frequency of spontaneous PTB before 28 weeks of gestation (%)	Frequency of spontaneous PTB before 32 weeks of gestation (%)	Frequency of spontaneous PTB before 37 weeks of gestation (%)
No prior PTB	0.23	0.85	8.8
Prior PTB at 23 to 27 weeks	5.1	10.2	27.1
Prior PTB at 28 to 34 weeks	3.0	5.4	24.0
Prior PTB at 35 to 36 weeks	1.2	3.5	20.9

PTB: preterm birth.

Data from: Mercer BM, Goldenberg RL, Moawad AH, et al. The preterm prediction study: Effect of gestational age and cause of preterm birth on subsequent obstetric outcome. National Institute of Child Health and Human Development Maternal-Fetal Medicine Units Network. Am J Obstet Gynecol 1999; 181:1216.

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خرید پکیج

Frequency of spontaneous preterm birth before 28 weeks in the current pregnancy based on previous history of spontaneous preterm birth