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. 2020 Oct;26(10):2353–2360. doi: 10.3201/eid2610.202551

Figure 3.

Figure 3

Semiquantitative real-time reverse transcription PCR Ct values for severe acute respiratory syndrome coronavirus 2 proficiency panel samples tested by PowerChek and Allplex 2019-nCoV kits, South Korea, March 23–27, 2020. Horizontal line within each box denotes the median value; x indicates the mean; top and bottom of box indicate third and first quartiles, respectively; error bars indicate minimum and maximum values; dots indicate outlier results. E gene (A) and RdRp gene (B) Ct values were from 67 laboratories using the PowerChek 2019-nCoV reagents; E gene (C), RdRp gene (D), and N gene (E) Ct values were from 38 laboratories using the Allplex 2019-nCoV reagents. Ct, cycle threshold.