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. 2021 Dec 14;8:786261. doi: 10.3389/fnut.2021.786261

Figure 5.

Figure 5

Total arsenic (ng/g) in NIST SRM 3398 Ginger (Z. officinale Roscoe) Rhizome. Individual laboratory data are plotted (circles) with standard deviation (n = 3, rectangle) in order of increasing magnitude. The color of the data rectangle indicates the analytical method employed. The solid black line is the consensus mean, and the green shaded region represents the consensus mean bounded by twice the consensus standard error. The black dashed lines represent the consensus range of tolerance calculated as the values above and below the consensus mean that result in an acceptable Z'comm score. The red shaded region represents the NIST range of tolerance, which encompasses the NIST-determined value bounded by twice its uncertainty and represents the range that results in an acceptable Z'NIST score. For a detailed discussion of the statistical treatment of the results, see Phillips et al. (109). Adapted with permission from Phillips et al., NISTIR 8203, 2018.