TABLE 1.

Distribution of characteristics within each maternal weight latent-class trajectory group in the study sample (n = 4436)¹

		Trajectory group
Characteristic	Sample size,2 n	1 (n = 2799)	2 (n = 1369)	3 (n = 268)
Prepregnancy BMI, kg/m2
Underweight, <18.5	284	9.9	0.0	0.0
Normal weight, 18.5–24.9	2897	88.3	31.9	0.0
Overweight, 25–29.9	829	1.8	53.9	3.0
Class 1 obese, 30–34.9	282	0	13.9	42.2
Class 2 obese, 35–39.9	102	0	0.3	37.3
Class 3 obese, ≥40	42	0	0	17.5
Prepregnancy BMI		20.9 ± 1.9	26.6 ± 2.9	36.4 ± 4.7
Gestational weight gain, kg		14.4 ± 5.4	15.5 ± 7.1	11.0 ± 8.6
Inadequate	1202	32.4	11.7	23.9
Adequate	1349	37.1	23.0	15.5
Excessive	1841	30.5	65.3	60.6
Postpartum weight retention, kg		1.5 ± 4.2	3.4 ± 7.2	3.4 ± 12.7
≥5	1092	14.6	33.9	34.7
Education at birth
Less than high school	852	13.4	12.5	16.4
High school	2941	65.1	68.7	69.1
College	643	21.5	18.8	14.5
Employment at birth
Unemployed	1486	29.0	29.0	32.5
Part-time	1345	31.7	27.1	22.7
Full-time	1605	39.3	43.9	44.8
Race/ethnicity
Non-Hispanic nonblack	2614	82.5	74.4	71.9
Non-Hispanic black	1099	12.1	17.1	23.2
Hispanic	723	5.5	8.5	4.9
Married at birth	3124	78.9	78.1	69.3
Equivalized household income at birth
Lowest tertile	1479	23.4	23.1	27.4
Middle tertile	1479	31.0	33.4	35.1
Highest tertile	1478	45.6	43.5	37.5
Age at birth, y
<20	229	3.8	2.5	1.3
20–30	3206	69.0	62.9	54.5
≥30	1001	27.3	34.6	44.2
Smoked during pregnancy	1186	28.9	23.8	20.5
Child birth year
Before 1985	1434	28.0	18.5	10.7
1985 until 1995	2617	63.7	66.9	62.7
During or after 1995	385	8.3	14.6	26.6
Child sex
Female	2151	48.7	45.9	50.8
Male	2285	51.3	54.1	49.2
Child weight for gestational age
Small for gestational	501	11.3	7.4	8.3
Appropriate for gestational	3437	78.1	76.1	74.5
Large for gestational age	498	10.6	16.5	17.2
Child ever breastfed	2291	60.1	56.6	47.7

¹Values are percentages or means ± SDs unless otherwise indicated. Percentages are weighted for the survey sampling design.

²Sample sizes are not weighted and refer to the number of mother-child pairs.