SELENOS and necrotizing enterocolitis: Factors showing significant association in univariate analysis were selected for further evaluation; they included ELGA, ELBW, Apgar score at 1 min, number of RCB transfusions, surfactant treatment, resuscitation, mechanical ventilation, duration of mechanical ventilation, presence of NEC, BPD, IVH, RDS, sepsis, or the SELENOS rs3877899 genotype (A allele dose), and co-occurrence of the SELENOS rs3877899GA+AA genotype with ELGA.