Table 2.

Characteristics of 910 participants by quartile of second trimester protein intake (as % of energy)

	Quartile of protein intake (% of energy)
Characteristics	1	2	3	4
Second trimester nutrient intakes	Mean
Protein (% of energy)	14.2	16.6	18.3	21.1
Protein (g/day)	78.1	89.8	96.5	104.2
Animal protein (g/day)	49.1	60.9	68.2	78.7
Total calories (kcal/day)	2197	2159	2111	1979
Maternal characteristics
Age (yr)	31.2	32.9	32.8	32.8
Race (%)
White	68.0	80.0	80.7	70.5
Black	16.4	7.8	7.5	11.5
Hispanic	6.7	4.4	4.0	4.4
Asian	4.4	4.4	4.0	8.8
Other	4.4	3.5	4.0	4.9
Pre-pregnancy height (m)	1.7	1.7	1.7	1.6
Pre-pregnancy BMI (kg/m2)	24.5	24.5	24.2	24.3
Married (%)	79.1	90.4	90.4	89.0
Education (%)
High school	8.4	3.9	5.7	5.7
<4 yr of college	25.3	22.6	15.4	18.5
4 yr of college	35.6	40.0	33.8	37.9
Graduate degree	30.7	33.5	45.2	37.9
Income (%)
<$20 000	2.7	1.3	1.8	3.1
$20–<$40 000	11.6	7.4	4.8	7.1
$40–$70 000	25.3	20.0	19.3	22.0
>$70 000	51.1	67.0	70.6	63.0
Missing	9.3	4.4	3.5	4.9
Smoked 3 months prior to pregnancy (%)	14.2	10.1	7.2	8.2
Pregnancy weight gain (kg)	15.4	16.1	15.6	15.5
Third trimester SBP (mm Hg)	110.5	111.9	111.0	111.3
Infant characteristics at birth
Male (%)	49.8	48.7	48.7	52.4
Birth weight (g)	3461	3521	3559	3481
Birth weight for gestational age z-score (units)	0.13	0.21	0.30	0.18
Gestational age (weeks)	39.5	39.7	39.7	39.6
Infant characteristics at 6-month visit
Age (months)	6.4	6.5	6.5	6.6
Weight (kg)	8.1	8.0	8.1	8.1
Length (cm)	66.8	66.4	66.7	66.7
SBP (mm Hg)	89.5	89.5	90.6	90.2
Diastolic BP (mm Hg)	56.4	56.7	56.7	57.7