Table 4.
Characteristics of the newborns enrolled in the allergic and non-allergic families cohorts
| Allergic Families | Non-Allergic Families | |||
| Characteristic | n | % | N | % |
| 560 | 100.0 | 49 | 100.0 | |
| Race or ethnicity* | ||||
| Hispanic of any race | 115 | 20.8 | 10 | 20.4 |
| Black alone | 386 | 69.8 | 37 | 75.5 |
| White alone | 7 | 1.3 | 0 | 0.0 |
| More than one race | 38 | 6.9 | 2 | 4.1 |
| All others | 7 | 1.3 | 0 | 0.0 |
| Missing | 7 | -- | 0 | -- |
| Sex | ||||
| Male | 287 | 51.2 | 25 | 51.0 |
| Female | 273 | 48.8 | 24 | 49.0 |
| Gestational age in weeks | ||||
| 34 | 9 | 1.6 | 0 | 0.0 |
| 35 | 13 | 2.3 | 0 | 0.0 |
| 36 | 25 | 4.5 | 1 | 2.0 |
| 37 | 61 | 10.9 | 6 | 12.2 |
| 38 | 100 | 17.9 | 10 | 20.4 |
| 39 | 173 | 30.9 | 15 | 30.6 |
| 40 | 118 | 21.1 | 11 | 22.4 |
| 41 | 59 | 10.5 | 6 | 12.2 |
| 42 | 2 | 0.4 | 0 | 0.0 |
| Type of delivery | ||||
| Spontaneous vaginal | 342 | 61.1 | 31 | 63.3 |
| Assisted vaginal | 43 | 7.7 | 4 | 8.2 |
| Elective c-section | 68 | 12.1 | 12 | 24.5 |
| Non-elective c-section | 107 | 19.1 | 2 | 4.0 |
| Breastfed at birth | 289 | 57.2 | 29 | 61.7 |
| Breastfeeding at 3 mos. | 121 | 24.0 | 13 | 27.7 |
| Household tobacco smoke exposure at 3 mos. | 263 | 58.7 | 23 | 56.1 |
| Continuous measures | Mean | SD | Mean | SD |
| Gestational age (weeks) | 38.7 | 1.5 | 39.0 | 1.3 |
| Birthweight (grams) | 3236.8 | 514.4 | 3211.8 | 503.9 |
| Length (cm) | 50.1 | 2.5 | 49.9 | 2.7 |
| Head circumference (cm) | 33.6 | 1.6 | 33.3 | 2.2 |
| 5-minute Apgar score | 8.9 | 0.5 | 8.9 | 0.5 |
*Determined by the open-ended question posed to the mother, "How would you describe the race, nationality, or ethnic background of your baby?"