Table 1.

Patient Characteristics by Ultrasound-Indicated Cerclage Placement

Characteristic	Cerclage (n=142)	No Cerclage (n=159)	P
Years of age (mean ± sd)	26.4 ± 5.5	26.5 ± 5.1	0.91
Race/ethnicity - n (%)			0.26
Black (non-Hispanic)	74 (52%)	99 (62%)
White (non-Hispanic)	26 (18%)	27 (17%)
Hispanic	26 (18%)	18 (11%)
Asian	0 (0%)	1 (1%)
Other	16 (11%)	14 (9%)
Pre-pregnancy BMI (mean ± sd)	29.8 ± 8.2	29.4 ± 7.2	0.64
Years of education (mean ± sd)	12.0 ± 2.8	11.9 ± 2.4	0.89
Cigarette use - n (%)	23 (16%)	31 (20%)	0.46
Any drug use - n (%)	5 (4%)	10 (6%)	0.27
One or more prior induced abortion - n (%)	24 (17%)	26 (16%)	0.90
Gestational age (wks) at randomization (mean ± sd)	19.3 ± 1.9	19.5 ± 2.0	0.41
Cervical length (mm) at randomization (mean ± sd)	18.4 ± 6.3	19.7 ± 5.3	0.05
U funnel – n (%)	28 (20%)	20 (13%)	0.09
Intent to use progesterone – n (%)*	54 (40%)	63 (41%)	0.87

^*10 participants were randomized prior to adding this stratum to the study (6 received ultrasound-indicated cerclage; 4 did not).