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. 2020 Jul 31;130:104567. doi: 10.1016/j.jcv.2020.104567

Fig. 1.

Fig. 1

Cycle threshold (Ct) values for N2 and RNAse P (RP) for NPS and saliva specimens. A) N2 Ct values by testing concordance. The N2 Ct value was set to 41 for samples in which only the N1 target was detected. The horizontal dashed line is at Ct = 40, the assay cut-off. Horizontal lines indicate the median and interquartile range (IQR). The median and IQR for each group are: 28.56 (18.3 to 33.5), 30.18 (20.32 to 36.66), 33.68 (32.5 to 37.99), and 37.62 (36.98 to 38.26) for Both (NPS), Both (Saliva), NPS Only, and Saliva Only, respectively. B) N2 Ct values for paired NPS and saliva samples. Pairs are connected by a line. The N2 Ct was set to 41 for samples in which N2 was not detected including those negative for SARS-CoV-2 RNA. The horizontal dashed line is at Ct = 40, the assay cut-off. Ct values were significantly lower for NPS when compared by Wilcoxon matched-pairs signed rank test (p = 0.0331). C) RP Ct values for NPS and saliva specimens. Median and IQR are 24.27 (23.46 to 24.96) and 22.63 (21.88 to 23.85), respectively.