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Subgroup analysis of NLR effect on BC risk. Prespecified subgroup analyses for risk factors were conducted to estimate OR with 95% CI among subgroups with the use of 2-sided P values. Higher preoperative NLR was an independent risk factor in all subgroups except for obese patients and MetS patients. BC = breast cancer, CI = confidence interval, MetS = metabolic syndrome, NLR = Neutrophil-to-lymphocyte ratio, OR = odds ratio.
