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(A) Forest plot of the sensitivity and specificity of NLR to predict mortality in COVID-19 patients. The pooled sensitivity (SEN) and specificity (SPE) were 0.80 (95% CI 0.72–0.85) and 0.78 (95% CI 0.70–0.85); (B) Summary receiver operating characteristic graph of the included studies. The AUC of NLR to predict mortality was 0.86 (95% CI 0.82–0.88)
