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Significative difference by Mann-Whytney's test (P-value < 0.05).
| Metal | Samples from the SNI area n | Samples from other districts n | SNI area mean score | Other districts mean score | P-value |
|---|---|---|---|---|---|
| Arsenic (As) | 18 | 7 | 9.50 | 22.00 | <0.0001 |
| Nickel (Ni) | 18 | 6 | 9.88 | 20.33 | 0.0002 |
