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 3

Multivariate probability modeling the effect of NT discordance ≥ 20% on birth weight discordance.

Odds ratio estimates
Effect	Point estimate	95% Wald; confidence limits		value
NT discordance ≥ 20%	1.168	0.771	1.771	0.4641
Chorionicity via US MCDA vs. DCDA	0.846	0.513	1.394	0.2863
Chorionicity via US MCMA vs. DCDA	0.13	0.006	2.674	0.2044
Maternal age	1.005	0.964	1.047	0.8186
Gestational age at delivery	0.873	0.818	0.933	< .0001
Maternal BMI < 18.5 vs. 18.5-24.9	0.926	0.281	3.053	0.9411
Maternal BMI 25-29.9 vs. 18.5-24.9	0.706	0.424	1.173	0.188
Maternal BMI 30+ vs. 18.5-24.9	1.288	0.783	2.12	0.1988
Parity 1 vs. 0	0.971	0.629	1.5	0.1409
Parity 2+ vs. 0	0.41	0.174	0.969	0.0429