Ultrasound-Indicated Cerclage in Twin Pregnancies: A Cohort Study

Table 1

Comparison of baseline characteristics based on singleton or twin pregnancy.

Parameter study population ()	Singleton pregnancy ()	Twin pregnancy ()	value
Maternal age (years)	34 (19–43)	33 (25–38)	0.01
Parity			<0.001
Primiparous	0 (0)	(73.7)
Multiparous	56 (100)	(26.3)
ART	4 (7.1)	26 (68.4)	<0.001
Prior preterm birth or second trimester loss	56 (100)	2 (5.3)	<0.001
Prior cervical surgery	4 (7.1)	1 (2.6)	0.65
BMI	24.7 (18.1–33.5)	24.1 (18.0–40.4)	0.93
GA at cerclage (weeks)	21.4 (16.4–23.6)	21.4 (16.3–23.4)	0.64
Use of tocolytics	22 (39.3)	21 (55.3)	0.14
Use of vaginal progesterone	56 (100)	36 (94.7)	0.08

Data are expressed as medians (ranges) and number (percentage). , which means statistical difference. ART: assisted reproductive technology; BMI: body mass index; GA: gestational age.