Obstetrics and Gynecology International / 2014 / Article / Tab 2

Research Article

Circumvallate Placenta: Associated Clinical Manifestations and Complications—A Retrospective Study

Table 2

Comparison of pregnancy outcomes between circumvallate placenta and control groups.

Circumvallate placenta ()Control () value

Gestational week at delivery (week) 32.8 (22.1–41.7)38.2 (22.1–42.6)<0.01
Extremely preterm delivery*29 (31.5%)214 (2.4%)<0.01
Preterm delivery 59 (64.1%)1069 (11.8%)<0.01
VB during the 1st trimester 30 (32.6%)85 (0.9%)<0.01
VB during the 2nd trimester36 (39.1%)53 (0.6%)<0.01
Subchorionic hematoma 14 (15.2%)93 (1.0%)<0.01
pPROM36 (39.1%)362 (4.0%)<0.01
PCROM 19 (20.6%)3 (0.03%)<0.01
Oligohydramnios22 (23.9%)177 (2.0%)<0.01
Placental abruption 10 (10.9%)120 (1.3%)<0.01
Delivery modality
Normal vaginal delivery 42 (45.6%)6397 (70.6%)<0.01
Instrumental delivery3 (3.2%)419 (4.6%)0.53
Elective cesarean section 4 (4.3%)1062 (11.7%)0.03
Emergency cesarean section 42 (45.6%)1180 (13.0%)<0.01

Extremely preterm delivery: delivery at gestational age between 22 weeks 0 days and 27 weeks 6 days.
VB: vaginal bleeding; pPROM: preterm premature rupture of membranes; PCROM: premature chemical rupture of membranes; PIH: pregnancy-induced hypertension.

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