Table 3.

Childhood obesity at 36 months by characteristics of the sample.

	Obesity at 36 months (N=609)
	Not Obese	Obese
Prepregnancy body mass index (kg/m2), % †
Underweight (<18.5)	96	4
Normal weight (18.5–24.9)	88	12
Overweight (25.9–29.9)	81	19
Obese (≥30.0)	82	18
Maternal race/ethnicity, %
White	85	15
Black	90	10
Income level ($/month), %
<400	88	12
≥400	86	14
Parity, %
Nulliparous	85	15
Multiparous	89	11
Prenatal smoking, %
None	88	12
<0.5 packs/day	86	13
0.5 to <1 packs/day	95	5
≥1 packs/day	82	19
Prenatal alcohol use, %
None	85	15
>0 to <1.5 drinks/week	92	8
1.5 drink/week to <1 drinks/day	90	10
≥1 drinks/day	8	17
Prenatal marijuana use, %
None	88	12
>0 to <0.5 joint/day	89	11
0.5 to <1 joints/day	85	15
≥1 joints/day	85	15
Gestational age at delivery (weeks), %
<37 weeks	93	7
≥37 weeks	87	13
Birth weight for gestational age z-score, % *
Small for age (<10th percentile)	90	10
Appropriate for age (10th to 90th percentile)	87	13
Large for age (>90th percentile)	82	18
Infant sex, %
Female	89	11
Male	86	14
Ever breastfed infant, %
Yes	85	15
No	88	12

^†Pearson chi-square test p<0.05

^*Reference for birth weight for gestational age z-score (20)