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 We aimed to assess the relationship between obstetric history and incidence of short cervical length (CL) at 24 weeks gestational age (GA) in women with a prior spontaneous preterm birth (PT.  Women with a singleton gestation and a history of spontaneous PTB on progesterone who received prenatal care at a single center from 2011 to 2016 were included. Those who did not undergo screening or had a history-indicated cerclage were excluded. The associations between short CL (25 mm) before 24 weeks and obstetrical factors including n