Table 1.
Participant Characteristics and Associations With Breastfeeding Duration (n=1037)
| Characteristic | Mean (SD) | Spearman r with breastfeeding duration | |
|---|---|---|---|
| Maternal age, years | 32.3 (5.2) | 0.18 | |
| Maternal KBIT-II | 107.2 (15.3) | 0.36 | |
| Gestation length, weeks | 39.7 (1.4) | 0.06 | |
| Birth weight for gestational age z-score | 0.2 (1.0) | 0.06 | |
| HOME-SF score | 18.4 (2.2) | 0.13 | |
| N (%) | Breastfeeding duration (months) | ||
| Mean | SD | ||
| Entire cohort | 1037 (100) | 6.5 | 4.6 |
| Mother | |||
| Nulliparous | |||
| No | 547 (52.7) | 6.6 | 4.6 |
| Yes | 490 (47.3) | 6.4 | 4.6 |
| Smoking status | |||
| Never | 735 (70.9) | 6.9 | 4.5 |
| Former | 205 (19.8) | 6.5 | 4.5 |
| During pregnancy | 96 (9.3) | 3.5 | 4.0 |
| Depressed at 6 months postpartum | |||
| No | 942 (90.8) | 6.6 | 4.6 |
| Yes | 96 (9.2) | 5.3 | 4.7 |
| Education level of mother | |||
| ≥ High school diploma | 89 (8.5) | 3.8 | 4.2 |
| Some college | 221 (21.3) | 4.7 | 4.5 |
| Bachelor's degree | 362 (34.9) | 6.6 | 4.3 |
| Graduate degree | 365 (35.2) | 8.2 | 4.2 |
| Employment status 6 months postpartum | |||
| Employed | 696 (67.1) | 6.1 | 4.5 |
| Employed, maternity leave | 68 (6.6) | 8.0 | 4.2 |
| Not employed, not looking | 221 (21.3) | 7.4 | 4.8 |
| Not employed, looking | 52 (5.0) | 5.5 | 4.8 |
| Child | |||
| Sex | |||
| Male | 515 (49.7) | 6.6 | 4.6 |
| Female | 522 (50.3) | 6.4 | 4.6 |
| Race/ethnicity | |||
| Asian | 157 (15.1) | 5.0 | 4.5 |
| Black | 40 (3.9) | 4.8 | 4.2 |
| Hispanic | 32 (3.1) | 5.5 | 3.8 |
| White | 120 (11.6) | 6.4 | 4.7 |
| Other | 688 (66.3) | 7.0 | 4.5 |
| Child care at 6 months | |||
| Center | 177 (17.1) | 6.6 | 4.4 |
| Other home | 282 (27.2) | 5.1 | 4.4 |
| In own home | 141 (13.6) | 6.8 | 4.4 |
| None | 437 (42.2) | 7.3 | 4.6 |
| English as second language (7-10 years) | |||
| No | 1024 (98.7) | 6.5 | 4.6 |
| Yes | 13 (1.3) | 5.3 | 3.7 |
| Family/household | |||
| Annual income | |||
| <$40,000 | 168 (16.2) | 4.4 | 4.6 |
| $40,000 to $70,000 | 219 (21.1) | 6.4 | 4.6 |
| ≥$70,000 | 651 (62.8) | 7.1 | 4.4 |
| Married/cohabitating | |||
| No | 79 (7.6) | 4.0 | 4.4 |
| Yes | 958 (92.4) | 6.7 | 4.5 |
| Education level of mother's partner | |||
| ≥ High school diploma | 150 (14.5) | 3.9 | 4.3 |
| Some college | 211 (20.3) | 5.3 | 4.5 |
| Bachelor's degree | 369 (35.6) | 6.9 | 4.5 |
| Graduate degree | 307 (29.6) | 8.2 | 4.1 |