| Micronutrient | Toxic metal | Model Characteristics, R2 (p value) | |||
| Linear | Quadratic | Cubic | Exponential | ||
| Se | Pb | 0.026 (0.235) | 0.095 (0.071) | 0.097 (0.149) | 0.021 (0.290) |
| Cd | 0.000 (0.910) | 0.040 (0.339) | 0.048 (0.465) | 0.000 (0.932) | |
| As | 0.021 (0.296) | 0.021 (0.565) | 0.027 (0.691) | 0.027 (0.224) | |
| Hg | 0.021 (0.296) | 0.144 (0.019) | 0.178 (0.020) | 0.017 (0.348) | |
| Cu | Pb | 0.275 (0.000) | 0.453 (0.000) | 0.545 (0.000) | 0.170 (0.002) |
| Cd | 0.038 (0.151) | 0.065 (0.168) | 0.155 (0.032) | 0.027 (0.225) | |
| As | 0.000 (0.900) | 0.002 (0.948) | 0.008 (0.941) | 0.000 (0.894) | |
| Hg | 0.009 (0.502) | 0.018 (0.633) | 0.025 (0.733) | 0.000 (0.929) | |
| Zn | Pb | 0.00 (0.163) | 0.000 (0.995) | 0.094 (0.160) | 0.000 (0.911) |
| Cd | 0.055 (0.081) | 0.081 (0.107) | 0.098 (0.161) | 0.024 (0.256) | |
| As | 0.001 (0.787) | 0.003 (0.828) | 0.029 (0.671) | 0.001 (0.827) | |
| Hg | 0.003 (0.693) | 0.037 (0.378) | 0.067 (0.321) | 0.000 (0.984) | |