Panel composition of the two rounds of environmental EQAP and concordant results per sample (inter-laboratory reproducibility).

aAll samples consisted of a mixture of soil, leaf litter, detritus, animal faeces.
bMean Ct value of duplicate IS2404 real-time PCR before samples were shipped to participants and after all participants had returned results.
cOne laboratory was missing a sample in round 1.

a. 所有样本均由土壤、地表枯枝落叶、腐屑以及动物粪便混合而成。
b. IS2404实时荧光定量PCR（real-time PCR）重复实验的平均循环阈值（Ct value），分别采集于样本寄送至参与者前，以及所有参与者返回实验结果后。
c. 在第1轮实验中，有一个实验室缺失了一份样本。