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 5

Multivariate probability modeling the effect of NT difference ≥ 0.9 mm (95^th percentile) on birth weight discordance.

Odds ratio estimates
Effect	Point estimate	95% Wald; confidence limits		value
NT difference ≥0.9 mm	2.538	1.215	5.299	0.0132
Chorionicity via US MCDA vs DCDA	0.772	0.462	1.289	0.3454
Chorionicity via US MCMA vs DCDA	0.131	0.006	2.701	0.2174
Maternal age	1.004	0.964	1.046	0.8464
Gestational age at delivery	0.873	0.817	0.932	< .0001
Maternal BMI < 18.5 vs. 18.5-24.9	0.852	0.254	2.861	0.8377
Maternal BMI 25-29.9 vs. 18.5-24.9	0.702	0.421	1.169	0.2176
Maternal BMI 30+ vs. 18.5-24.9	1.287	0.78	2.123	0.1729
Parity 1 vs. 0	0.973	0.629	1.503	0.1506
Parity 2+ vs. 0	0.419	0.177	0.99	0.0481