| Optimal levels of “Sensitivity”, “Specificity” and “Accuracy” |
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| |||
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| Rb | 0.92 mg/L | 90 ± 8 | 72 ± 5 | 74 ± 5 |
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| Zn | 120 mg/L | 92 ± 6 | 92 ± 3 | 92 ± 2 |
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| Zn/Br | 24.0 | 80 ± 13 | 97 ± 2 | 95 ± 2 |
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| Zn/Fe | 3.3 | 82 ± 12 | 99 ± 1 | 97 ± 2 |
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| Zn/Sr | 70 | 88 ± 12 | 98 ± 2 | 96 ± 3 |
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| ZnRb | 57 | 90 ± 8 | 93 ± 3 | 92 ± 3 |
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| (ZnRb)/Fe | 5.5 | 100-9 | 96 ± 2 | 96 ± 2 |