TABLE 1.
Subject characteristics (N = 155).
| Variable | N (%) or Mean [Range] |
| Age | 32.4 [20–45] |
| Racea | |
| White | 147 (94.8) |
| Other | 3 (1.9) |
| Relationship statusb | |
| Married | 126 (81.3) |
| Separated or divorced | 4 (2.6) |
| Single and never married | 12 (7.7) |
| Smoking historyc | |
| No | 126 (81.3) |
| Yes | 15 (9.7) |
| Prepregnancy BMId | 26.0 [17.4–47.8] |
| Weight gain during pregnancy (lbs)d | 32.7 [4–63] |
| Weight gain categorye | |
| Less | 23 (14.8) |
| Recommended | 36 (23.2) |
| More | 64 (41.3) |
| Parityf | 1.8 [1–5] |
| Delivery modeb | |
| Vaginal | 101 (65.2) |
| Elective Cesarean section | 22 (14.2) |
| Non-elective Cesarean section | 19 (12.3) |
| Gestational diabetesg | |
| No | 125 (80.6) |
| Yes | 8 (5.2) |
| Maternal prenatal antibioticsh | |
| No | 96 (61.9) |
| Yes | 23 (14.8) |
| Maternal antibiotics by 4-months postpartumi | |
| No | 113 (72.9) |
| Yes | 17 (11.0) |
| Peripartum antibioticsj | |
| No | 69 (44.5) |
| Yes | 71 (45.8) |
| Infant feeding behaviork | |
| Exclusively breastfed | 109 (70.3) |
| Combination fed | 22 (14.2) |
| Gestational age at delivery | 39.2 [30.0–42.4] |
| Infant sexl | |
| Female | 73 (47.1) |
| Male | 74 (47.7) |
| Postpartum collection week | 6.6 [3.7–12.0] |
Footnotes indicate the number of subjects with missing values: a5, b13, c14, d17, e32, f3, g22, h36, i25, j15, k24, l8.