Table 1 Participant characteristics, GROW 2012–2013
From: Breastfeeding, socioeconomic status, and long-term postpartum weight retention
|  | All N = 2144 | Low SES N = 1048 | High SES N = 1096 | p-value |
|---|---|---|---|---|
Mean age at birth, years | 29.0 ± 0.15 | 26.6 ± 0.20 | 32.5 ± 0.16 |  < .0001 |
Mean Gestational age at birth, weeks | 38.0 ± 0.05 | 38.0 ± 0.07 | 38.0 ± 0.07 | 0.77 |
Ever breastfed, N (%) | 1751 (81) | 773 (74) | 978 (89) |  < .0001 |
Months breastfeeding, average | 8.0 ± 0.20 | 7.5 ± 0.28 | 9.8 ± 0.3 |  < .0001 |
Breastfed at least 6 months, N (%) | 1306 (61) | 533 (51) | 773 (70) |  < .0001 |
Excellent/good self-rated health, N (%) | 1772 (83) | 769 (73) | 1003 (91) |  < .0001 |
Race, N (%) |  |  |  |  < .0001 |
  Asian | 248 (12) | 56 (5) | 192 (17) |  |
  Black | 268 (12) | 171(16) | 97 (9) |  |
  Latina – Foreign born | 434 (20) | 403 (39) | 31 (3) |  |
  Latina – US born | 360 (17) | 238 (23) | 122 (11) |  |
  White | 834 (39) | 180 (17) | 654 (60) |  |
Education Level, N (%) | ||||
  Less than High School | 365 (17) | 365 (35) | 0 |  |
  High School/GED | 410 (19) | 368 (35) | 42 (4) |  |
  Some College | 392 (18) | 242 (23) | 150 (14) |  |
  College Graduate | 977 (46) | 73 (7) | 904 (82) |  |
Percent federal poverty level, N(%) | ||||
  0–100 | 481 (22) | 481 (46) | 0 |  |
  101–200 | 402 (19) | 402 (38) | 0 |  |
  201–300 | 213 (10) | 123 (12) | 90 (8) |  |
  301–400 | 1048 (49) | 42 (4) | 1006 (92) |  |
Parity, N (%) |  |  |  |  < .0001 |
  1 | 847 (39) | 348 (33) | 499 (46) |  |
  2 to 4 | 1213 (57) | 628 (60) | 585 (53) |  |
  5 or more | 84 (4) | 72 (7) | 12 (1) |  |