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. 2020 Jul 21;26:111–121. doi: 10.1016/j.jare.2020.07.010

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© 2020 The Authors. Published by Elsevier B.V. on behalf of Cairo University.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 2 — The correlation between the results for the sample 201901 reported by any two 16Ss laboratories (A) or SMs laboratories (B) was evaluated by Spearman's rank correlation coefficient. The number in every square represents the Spearman r value. The higher the r value is, the stronger the correlation. A square marked with a black circle means that there is no correlation between the results of the two corresponding laboratories (P value >0.05). “Expected” indicates the designed value by the NCCL.