| Heavy metal | Distance at 200 m from TD25 | Distance at 400 m from TD25 | ||||
| Mean difference | 95% CI | Mean difference | 95% CI | |||
| Lower | Upper | Lower | Upper | |||
| Fe | −0.09 | −0.16 | −0.02 | 0.06 | 0.01 | 0.11 |
| Cu | −0.11 | −0.12 | −0.09 | −0.04 | −0.12 | −0.01 |
| Mn | −0.09 | −0.17 | −0.01 | 0.02 | −0.02 | 0.05 |