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Risk of preterm birth in a third pregnancy
Risk of preterm birth in a third pregnancy
Obstetric history
Risk of PTB in third pregnancy (%)
Two prior preterm births
42
Both at 32 to 36 weeks
33
Both at less than 32 weeks
57
Term birth followed by PTB
21
PTB followed by term birth
13
Two prior term births
5
These data were derived from women with spontaneous or indicated preterm birth.
PTB: preterm birth.
Data from: McManemy J, Cooke E, Amon E, Leet T. Recurrence risk for preterm delivery. Am J Obstet Gynecol 2007; 196:576.
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