Table 2.

Regression Results

		Fold 1 β	Fold 2 β	Fold 3 β	Fold 4 β	Fold 5 β
Predicting the likelihood of not smoking during pregnancy (Inflated Zeros)
Maternal XMGV
Baseline		1.17	−0.56	0.68	0.08	−0.12
Controlled		2.29	−0.49	1.22	0.95	0.03
Child XMGV
Baseline		−1.15	−0.96	−0.09	−0.96	−0.31
Controlled		−2.61*	−0.55	−0.19	−1.13	−0.23
Predicting SDP severity (Count, if SDP is present)
Maternal XMGV
Baseline		−0.08	−0.02	−0.22	1.57	−0.10
Controlled		−0.15	−0.54	−1.16	1.65	0.09
Child XMGV
Baseline		0.11	−0.50	−0.10	0.15	−0.42
Controlled		−0.35	−0.47	−0.16	0.88	−0.68
Predicting Birth Weight
Main effects Only
Maternal XMGV		0.66	0.23	0.88	0.55	0.58
Child XMGV		0.03	0.63	0.56	0.39	−.31
SDP		−35.23*	−51.46*	−46.27*	−19.54*	−35.31*
Controlled
Maternal XMGV		0.98	−0.14	−0.28	0.93	0.71
Child XMGV		−0.06	0.54	0.34	0.15	−0.40
SDP controlling for covariates and maternal XMGV		−21.46*	−44.82*	−57.17*	−18.24*	−39.46*
SDP controlling for covariates and child XMGV		−22.51*	−44.84*	−57.16*	−19.27*	−39.59*

Note.

^*p < .001.

Covariates include child sex, maternal educational attainment, social class, psychiatric problems, and age. XMGV = xenobiotic metabolism gene variants.