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 4

Multivariate probability modeling the effect of NT discordance  on birth weight discordance.

Odds ratio estimates
Effect	Point estimate	95% Wald; confidence limits		value
NT discordance ≥ 14%	1.086	0.734	1.606	0.6807
Chorionicity via US MCDA vs DCDA	0.847	0.514	1.395	0.2734
Chorionicity via US MCMA vs DCDA	0.125	0.006	2.548	0.1939
Maternal age	1.005	0.965	1.047	0.8092
Gestational age at delivery	0.872	0.817	0.932	< .0001
Maternal BMI < 18.5 vs. 18.5-24.9	0.937	0.284	3.091	0.9585
Maternal BMI 25-29.9 vs. 18.5-24.9	0.706	0.425	1.174	0.1871
Maternal BMI 30+ vs. 18.5-24.9	1.282	0.778	2.113	0.2086
Parity 1 vs. 0	0.969	0.627	1.495	0.14
Parity 2+ vs. 0	0.407	0.172	0.961	0.0414