. Author manuscript; available in PMC: 2012 Sep 1.

Published in final edited form as: Neurotoxicol Teratol. 2011 Jul 21;33(5):567–574. doi: 10.1016/j.ntt.2011.07.004

Table 3.

Dose-response Analyses by Trimester of Exposure

Predictor Variables	Standardized Beta	Change in R²	F
Regression 1: First trimester exposure and RSA
1. Maternal Age	.053
Maternal Education	.005
2. Prenatal Alcohol	−.22
Prenatal Marijuana	.136	.053	.95
3. Smokers vs. Nonsmokers^*	−.266	.064	2.11

Regression 2: Second trimester exposure and RSA
1. Maternal Age	.056
Maternal Education	.018
2. Prenatal Alcohol	−.061
Prenatal Marijuana	.107	.014	.27
3. Smokers vs. Nonsmokers	−.143	.019	1.08

Regression 3: Third trimester exposure and RSA
1. Maternal Age	.056
Maternal Education	.018
2. Prenatal Alcohol	−.093
Prenatal Marijuana	−.047	.014	.24
3. Smokers vs. Nonsmokers	−.186	.031	1.41

p < 0.05