Outcome of patients in microclusters of blood-culture proven sepsis.

Legend: IVH intraventricular haemorrhage; Surgery for PDA Patent Ductus arteriosus, NEC necrotizing enterocolitis, FIP focal intestinal perforation, ROP retinopathy of prematurity (kryo- or laser therapy); BPD bronchopulmonary dysplasia; severe complication: IVH grade IV, posthaemorrhagic hydrocephalus with need for VP shunt, periventricular leukomalacia, surgery for NEC/FIP or ROP and BPD;p-values were derived from chi-square test if not otherwise indicated (* Mann-Whitney-U test comparing linked cases vs. first patient in cluster.