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Proportion of preterm birth by etiology

Proportion of preterm birth by etiology
Etiology Frequency (percent)
Spontaneous preterm labor 30 to 50
PPROM 5 to 40
Multiple gestation 10 to 30
Preeclampsia/eclampsia 12
Antepartum bleeding 6 to 9
Fetal growth restriction 2 to 4
Other 8 to 9
PPROM: preterm premature rupture of membranes.
Adapted from: Slattery MM, Morrison JJ. Lancet 2002; 360:1489.
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