TABLE 1

Cohort Characteristics (N = 7048)

Characteristicn%
Gestational age, wk, mean (SD)38 (1.7)
 <38 wk279139.6
Birth wt, g, mean (SD)3237 (577)
Male sex383054.3
Infant race and ethnicity
 White210629.9
 Asian235733.4
 Hispanic160722.8
 African American3565.1
 Other4536.4
 Unknown1692.4
DAT
 Positive101914.5
 Negative334047.4
 Not done268938.2
Feeding during phototherapy hospitalization
 Breast milk only205129.1
 1–3 formula feedings99414.1
 4–10 formula feedings260537.0
 ≥11 formula feedings110715.7
 Unknown2914.1
Phototherapy during birth hospitalization436461.9
Initiation of phototherapy
 Age, d, mean (SD)2.3 (1.3)
 Relative TSB, mg/dL, mean (SD)0.1 (2.0)
Termination of phototherapy
 Age, d, mean (SD)3.6 (1.3)
 Estimated TSB, mg/dL, mean (SD)9.8 (2.7)
 Estimated relative TSB, mg/dL
  <−131972.8
  −13 to <−10115316.4
  −10 to <−7267738.0
  −7 to <−4211430.0
  −4 to <083911.9
  ≥0681.0
Home phototherapy order
 During inpatient phototherapy3104.4
 After inpatient phototherapy termination4626.6
Rebound hyperbilirubinemia within 72 h3244.6
 ≥0 to <1 above AAP phototherapy threshold1592.3
 ≥1 to <2 above AAP phototherapy threshold861.2
 ≥2 above AAP phototherapy threshold791.1
Recurrent inpatient phototherapy below threshold340.5
  • —, not applicable.