TABLE 1

Demographics of the Cohort (n = 9111)

Demographicn%
Gestational age, wk
    34–37312134.2
    38–40516256.7
    >408289.1
Gender
    Female397043.5
    Male513956.4
    Missing20.01
Race
    White374441.1
    Black143315.7
    Hispanic318334.9
    Other7518.3
Birth weight, kg
    >2.5766484.1
    1.5–2.5129914.3
    <1.5550.01
    Missing930.01
Apgar score at 1 min
    0–36477.1
    4–6110512.1
    7–10710378
    Missing2562.8
Apgar score 5 min
    0–3901
    4–63714.1
    7–10839292.1
    Missing2582.8
Maternal age, y
    13–19146416
    20–29466151.2
    30–39280330.8
    40–491791.9
    Missing40.1
Admission type
    From hospital delivery325935.8
    From home delivery2893.1
    From newborn nursery378241.5
    Hospital transfer103511.4
    Other4985.5
    Missing2482.7
Day of life at time of culture
    0245026.9
    1248927.3
    2136214.9
    36877.5
    4–791910.1
    8–28102111.2
    29–601441.6
    61–150330.4
    Missing60.1