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Comparison of the mean serum levels of selenium, among children from different countries (as mentioned previously [10])
| Country | Overall mean (μg/l) | Age range (years) |
| Austria | 48 | 1–15 |
| Finland | 58.5 | 1–15 |
| Belgium | 60 | 1–15 |
| Germany | 65.5 | 1–18 |
| France | 67 | 3–16 |
| England | 74.2 | 2–16 |
| Iran | 84.3 | 1–16 |
| Japan | 84.5 | 1–15 |
| Slovenia | 85 | 1–13 |
| Turkey | 89 | 1–16 |
| US | 106 | 1–18 |
| Canada | 126 | 1–9 |
