Table 1. Perinatal Characteristics of Newborns (≥35 Weeks’ Gestational Age) With Serum Bilirubin Levels of 30 mg/dL or Highera.
| Characteristic | Newborns, No. (%) |
|---|---|
| Total No. | 67 |
| Family history | |
| Of hemolytic disease | 3 (4) |
| Sibling treated for neonatal hyperbilirubinemia | 8 (12) |
| Maternal characteristic | |
| Primipara | 24 (36) |
| Asian | 14 (21) |
| Overweight or obese | 16 (24) |
| Diabetes, any | 0 |
| Blood group O or Rh negative | 40 (67) |
| Mode of delivery | |
| Vaginal, noninstrumental | 60 (90) |
| Vaginal, vacuum extraction | 3 (4) |
| Cesarean | 4 (6) |
| Gestational age, wk | |
| 35-36 | 4 (6) |
| 37-38 | 38 (57) |
| 39-40 | 19 (28) |
| ≥41 | 6 (9) |
| Infant characteristic | |
| Male sex | 49 (73) |
| Birth weight, median (range), g | 3542 (2290-4600) |
| SGA | 1 (1) |
| AGA | 55 (82) |
| LGA | 11 (16) |
| Maximum serum bilirubin level, median (range), mg/dL | 32 (30-50) |
| Maximum serum bilirubin level, median (range), μmol/L | 542 (510-847) |
Abbreviations: AGA, appropriate for gestational age; LGA, large for gestational age; SGA, small for gestational age.
a
The SI unit for the bilirubin levels is 510 μmol/L or higher.