. Author manuscript; available in PMC: 2011 Nov 14.

Published in final edited form as: Am J Obstet Gynecol. 2010 Jul 1;203(3):219.e1–219.e5. doi: 10.1016/j.ajog.2010.04.047

Table 1.

Linear regression model showing the relationship between each variable and the log of betamethasone concentrations in maternal serum and fetal cord blood in ng/mL

	Maternal Serum			Fetal Cord Blood
	Estimate	Standard Error	P-value	Estimate	Standard Error	P-value
Twins	0.05242	0.10121	0.61	0.1412	0.0954	0.14
BMI ≥ 30 kg/m²	−0.04237	0.09939	0.67	−0.1704	0.1097	0.12
Number of courses	−0.01369	0.04162	0.74	−0.0928	0.0483	0.05
Days from last course to delivery	−0.12501	0.02233	<.0001	−0.1249	0.0210	<.0001
Gestational age at delivery (weeks)	0.00028720	0.01856	0.99	0.0178	0.0204	0.38