Table 2 Cutoff values of the antibody levels.

From: Low SARS-CoV-2 antibody titers may be associated with poor clinical outcomes for patients with severe COVID-19

 

Cutoff (obtained from ROC curve, refer to Supplementary Figs. S3–S6 online)

IgG (day 7)

0.02 (Sensitivity 38.4%, Specificity 92.3%, AUC 0.66)

IgM (day 10)

0.08 (Sensitivity 40.0%, Specificity 92.3%, AUC 0.68)

IgM (day 12)

0.11 (Sensitivity 47.8%, Specificity 92.3%, AUC 0.70)

IgG (day 12)

0.58 (Sensitivity 45.7%, Specificity 92.9%, AUC 0.68)

IgM (day 14)

0.27 (Sensitivity 42.2%, Specificity 100%, AUC 0.70)

IgG (day 14)

1.65 (Sensitivity 55.6%, Specificity 86.7%, AUC 0.69)

  1. Ig immunoglobulin, ROC receiver operating characteristic, AUC area under the concentration–time curve.
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