Table 1.
Characteristics of the 139 Infants in the Study Population at Enrollment, by Cohort
| Characteristic | Nonhospitalized (n = 55) |
Hospitalized (n = 84) |
P |
|---|---|---|---|
| Age at infection, mo | |||
| Mean ± SE | 4.1 ± 0.3 | 2.8 ± 0.2 | < .001 |
| Range | 1.1–8.9 | 0.5–9.4 | |
| Gestational age, wk (range) | .26 | ||
| Mean ± SE | 39.1 ± 0.2 | 38.8 ± 0.1 | |
| Range | 36–42 | 36–41 | |
| Male sex | 25 (45) | 41 (49) | .73 |
| White | 34 (62) | 65 (77) | .06 |
| Hispanic | 9 (16) | 11 (13) | .63 |
| Cesarean section delivery | 13 (24) | 27 (32) | .34 |
| Birth weight, kg | .82 | ||
| Mean ± SE | 3.3 ± 0.1 | 3.4 ± 0.1 | |
| Range | 1.8–5.3 | 1.7–4.9 | |
| Maternal age, y | .08 | ||
| Mean ± SE | 29.8 ± 0.7 | 28.1 ± 0.7 | |
| Range | 19–41 | 17–44 |
Data are no. (%) of infants, unless otherwise indicated.
Abbreviation: SE, standard error.