Abstract

Spontaneous preterm birth (sPTB) has proven to be an important risk factor for recurrent sPTB, yet the lower limit of gestational age of prior birth is not well defined. In this study, we assessed the risk of recurrent sPTB following immature and extreme preterm birth between 16+0 - 27+6 weeks and we assessed the relationship between the interpregnancy interval and the recurrent risk.

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