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. 2021 Dec 24:jfab161. doi: 10.1093/jalm/jfab161

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© American Association for Clinical Chemistry 2021. All rights reserved. For permissions, please email: journals.permissions@oup.com.

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Fig. 1 — ROC analysis for the IgG antibodies to 4 SARS-CoV-2 antigens detected by MSD assay. (A) ROC plots for the IgG antibodies to SARS-CoV-2 antigens. (B) Cut points that resulted in a specificity of at least 99.0% was chosen. AUC values for each individual antibodies, corresponding standard errors and P values are listed. P denotes statistical significance of difference from AUC = 0.5 or line of no discrimination based on z test, calculated using the Excel AnalyzeIT software.