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ROC curve for lymphocyte count (grey) and albumin (black dashed) as a predictor of COVID-19 on admission. Lymphocyte: Area under the curve 60.7% (95% CI 56.7%–64.6%, p < 0.001). Threshold of 0.93 or less has 58.2% specificity and 56.6% sensitivity. Albumin: Area under the curve 61.3% (95% CI 57.5%–65.2%, p < 0.001). Threshold of 36 g/dL or less has 59.1% specificity and 57.1%sensitivity.
