Saudi Med J
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Multicenter Study
Prevalence of preterm birth and risk factors associated with it at different gestational ages: A multicenter retrospective survey in China.
To investigate the prevalence of preterm birth (PTB) and the risk factors for different gestational age subgroups of preterm birth in China. ⋯ Placental abruption, placenta previa, chorioamnionitis, and HDP were more predictive of early PTB; GDM and ICP were more predictive of late PTB.