Fig. 1

Flow chart of the study population. Treated hemolytic NHB newborns were exactly matched to non-NHB newborns on delivery hospital/provider, gender, delivery route (Csection or vaginal), estimated GA, and post-index health plan continuous enrollment. When the matching of delivery hospital/provider was not possible, residence zip code (5-digit) was used instead. After all of the above factors were matched, newborn with the closest DOB within 5 years was selected. DOB: date of birth; GA: gestational age; NHB: neonatal hyperbilirubinemia