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(A and B) ROC curve of NLR, CRP, WBC, ANC and the combinations of CRP and NLR, and CRP and ANC for discrimination of serious bacterial infection. (A) Left: age <28 days. (B) Right: age 29–90 days. ANC, absolute neutrophil count; CRP, C reactive protein; NLR, neutrophils to lymphocytes ratio; ROC, receiver operating characteristic; WBC, white cell count.
