Table 3. Correlation* between mercury, arsenic, nickel and tin .
| Mercury | Arsenic | Nickel | ||||
| Item | r | P | r | P | r | P |
| Arsenic | 0.12 | 0.48 | - | - | - | - |
| Nickel | - 0.83 | 0.01 | 0.31 | 0.46 | - | - |
| Tin | 0.36 | 0.38 | 0.43 | 0.29 | - 0.36 | 0.94 |
* Classified by Spearman rank
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