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. 2021 Feb 15;291:114100. doi: 10.1016/j.jviromet.2021.114100

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© 2021 The Author(s)

Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.

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Fig. 4 — COMPARISON OF S AND E Ct VALUES IN PATIENT SPECIMENS: A. Passing-Bablok regression of S and E Ct values from patient specimens. B. Plot of residuals with histogram and Q-Q plot showing a non-gaussian distribution. C. Bland-Altman analysis of the difference between S and E Ct values. The mean of S and E Ct values is plotted against their difference. D. Wilcoxon test (paired samples) analysis of the Ct values, p < 0.0001.