Table 1 Full sample characteristics

Age at survey

 8–11 weeks

2026 (61.4)

62.9 (59.4–66.4)

*

 12–15 weeks

564 (17.1)

17.0 (15.5–18.5)

*

 16–19 weeks

323 (9.8)

9.4 (7.6–11.2)

*

 20+ weeks

384 (11.6)

10.7 (9.0-12.4)

*

Gender

 Male

1685 (51.2)

50.7 (49.0-52.4)

51.2

 Female

1608 (48.8)

49.3 (47.6–51.0)

48.8

Birth weight

 <2500

202 (6.2)

5.7 (4.6–6.8)

8.0

 2500+

3076 (93.8)

94.3 (93.2–95.4)

91.9

Parity

 1

1215 (37.0)

37.9 (35.3–40.5)

39.7

 2

1095 (33.3)

33.7 (32.0-35.3)

31.5

 3+

978 (29.7)

28.4 (25.7–31.2)

28.3

Mother’s age

 Less than 20

275 (8.3)

7.5 (4.8–10.3)

7.8

 20 to 29

1788 (54.2)

52.2 (48.7–55.6)

51.6

 30 or more

1234 (37.4)

40.3 (35.4–45.2)

40.6

Race/ethnicity

 NH-White

1275 (38.7)

52.3 (46.4–58.2)

54.1

 NH-Black

828 (25.1)

12.9 (10.2–15.6)

14.8

 Latiné/Hispanic

912 (27.7)

26.0 (20.9–31.1)

23.0

 Other

281 (8.5)

8.8 (6.4–11.2)

8.0

Mother’s Education

 Less than HS

478 (14.6)

12.8 (8.7–16.9)

17.1

 HS or GED

833 (25.4)

23.5 (20.6–26.5)

25.1

 Some college

1041 (31.7)

30.8 (28.1–33.5)

29.0

 College or more

932 (28.4)

32.9 (26.6–39.2)

28.8

Region

 Northeast

634 (19.2)

21.2 (2.5–39.9)

*

 Midwest

496 (15.0)

12.8 (1.3–24.3)

*

 South/Southeast

1383 (41.9)

41.5 (20.2–62.7)

*

 West

784 (23.8)

24.5 (9.2–39.8)

*

Household Income

 Less than $20,000

1158 (35.1)

29.5 (24.7–34.3)

*

 $20,000–49,999

838 (25.4)

24.8 (19.9–29.7)

*

 $50,000 or more

577 (17.5)

19.8 (16.4–23.1)

*

 Unknown

724 (22.0)

26.0 (20.0–32.0)

*

Marital Status

 Never Married

1454 (44.3)

37.7 (33.5–41.9)

*

 Married

1658 (50.5)

57.0 (52.6–61.4)

*

 Other

170 (5.2)

5.3 (4.0-6.6)

*