Primiparity: an 'intermediate' risk group for spontaneous and medically indicated preterm birth.


OBJECTIVE Most women in their first pregnancy are at 'unknown' risk for preterm birth. We hypothesized that such women may be at an increased risk for preterm birth in comparison to those with a prior term birth. METHODS We used Missouri's maternally-linked data (1989-97), comprised of women delivering their first singleton live birth (N = 259 431) and… (More)


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