Comparing newborns with vs without available ABO blood group information showed that rates of neonatal jaundice or hyperbilirubinemia were higher among those with data (14 290 [10.3%] vs 31 095 [5.3%]), as were rates of hemolytic disease of the newborn (2297 [1.7%] vs 3400 [0.6%]) and NICU admission (23 390 [16.9%] vs 65 981 [11.2%]) (eTable 4 in Supplement 1). This evidence concerns the gene ABO and Hyperbilirubinemia.