. Author manuscript; available in PMC: 2011 Sep 1.

Published in final edited form as: Am J Obstet Gynecol. 2010 Sep;203(3):259.e1–259.e5. doi: 10.1016/j.ajog.2010.07.002

Table 1.

Demographic Characteristics

	Funnel Type
	None (n=154)	V (n=99)	U (n=48)	p-value
Actual Cerclage Placement	67 (44)	53 (54)	32 (67)	0.015
Race/ethnicity^* - no. (%) Black (non-Hispanic) White (non-Hispanic) Hispanic Other	89 (58) 31 (20) 23 (15) 11 (7)	62 (62) 15 (15) 11 (11) 11 (11)	22 (46) 7 (15) 10 (21) 9 (10)	0.14
Maternal age (y)	25.9 ± 5.4	26.5 ± 5.1	28.2 ± 4.8	0.03
Number of prior births (n)	2 (1, 4)^†	2 (1, 4)^†	1 (1, 3)^†	0.15
Gestational age of earliest prior preterm birth (wks)	25.5 ± 4.6	23.9 ± 4.7	21.5 ± 3.9	< 0.0001
Weeks of gestation at first vaginal sonogram (wks)	17.5 ± 1.3	17.2 ± 1.2	17.4 ± 1.5	0.22
Weeks of gestation at randomization (wks)	19.4 ± 2.0	19.5 ± 2.0	19.3 ± 1.9	0.91
Baseline cervical length at randomization visit (mm)	23.6 ± 5.3	20.3 ± 5.6	14.2 ± 7.2	< 0.0001
Shortest cervical length at randomization visit (mm)	21.1 ± 4.3	18.8 ± 5.2	13.0 ± 6.7	< 0.0001

Plus-minus values are means and one standard deviation.

Race and ethnic group are self-reported

^†

Median and interdecile range