Table 3. Logistic regression estimates of associations between SGA and menarche before age 11 and between maternal characteristics and menarche before age 11.

	Unadjusted	Adjusted for maternal demographics	Adjusted for maternal demographics, pre-pregnancy obesity, pre-pregnancy overweight, and prenatal smoking
	OR	AOR	AOR
	(95% CI)	(95% CI)	(95% CI)
SGA	1.46	1.45	1.47
	(0.89, 2.42)	(0.86, 2.46)	(0.85, 2.52)
Race-ethnicity
Non-Hispanic White		ref	ref
Non-Hispanic Black		2.21	2.06
		(1.22, 4.03)	(1.12, 3.79)
Hispanic		2.38	2.28
		(1.22, 4.66)	(1.15, 4.49)
Other		2.46	2.42
		(0.82, 7.39)	(0.80, 7.32)
Education
High school graduate		1.19	1.23
		(0.78, 1.82)	(0.80, 1.89)
Less than high school		ref	ref
Nativity
US born		ref	ref
Foreign born		0.88	0.93
		(0.49, 1.59)	(0.52, 1.68)
Age
< 20 years		1.70	1.90
		(0.69, 4.20)	(0.76, 4.72)
20–34		1.44	1.50
		(0.66, 3.15)	(0.68, 3.27)
35+		ref	ref
Relationship with child’s father
Married		0.77	0.77
		(0.43, 1.38)	(0.43, 1.38)
Cohabiting but not married		1.10	1.10
		(0.75, 1.63)	(0.74, 1.63)
Neither married not cohabiting		ref	ref
Parity
First birth		0.97	1.02
		(0.66, 1.43)	(0.69, 1.52)
Second or higher order birth		ref	ref
Health insurance for birth
Medicaid		0.87	0.88
		(0.57, 1.34)	(0.57, 1.36)
Other		ref	ref
Pre-pregnancy weight
Obese			1.64
			(1.02, 2.62)
Overweight			1.55
			(0.93, 2.57)
Normal or underweight			ref
Prenatal smoking
Any			1.09
			(0.70, 1.69)
None			ref

Notes: AOR = adjusted odds ratio. OR = odds ratio. SGA = small-for-gestational age = <10th percentile of sex-specific birth weight for gestational age. (N = 1,027). SGA was based on birth weight and LMP-based gestational age and compared to the national U.S. sex-specific distribution of LMP-based SGA from 1999–2000. Fully adjusted models included a binary indicator for missing data on pre-pregnancy weight. Statistically significant estimates at p < .05 are in bold.