The Association between Intertwin Difference in First Trimester Crown-Rump Length, Nuchal Translucency, and Birth Weight Discordance in Twin Pregnancies: A Retrospective Cohort Study

Table 2

Multivariate probability modeling the effect of CRL discordance ≥ 10% on birth weight discordance.

Odds ratio estimates
Effect	Point estimate	95% Wald; confidence limits		value
CRL discordance ≥ 10%	3.715	2.248	6.141	< .0001
Chorionicity via US MCDA vs. DCDA	0.860	0.516	1.432	0.3159
Chorionicity via US MCMA vs. DCDA	0.150	0.007	3.010	0.2335
Maternal age	1.002	0.961	1.044	0.9349
Gestational age at delivery	0.873	0.816	0.934	< .0001
Maternal BMI < 18.5 vs. 18.5-24.9	1.232	0.373	4.065	0.7375
Maternal BMI 25-29.9 vs. 18.5-24.9	0.727	0.433	1.222	0.1098
Maternal BMI 30+ vs. 18.5-24.9	1.399	0.841	2.328	0.2291
Parity 1 vs. 0	1.121	0.721	1.744	0.0671
Parity 2+ vs. 0	0.441	0.184	1.053	0.0454