| Sample ID | Average k-values | R2 | ||
| k1 | k2 | k3 | ||
| NNR | 531 | 0.0785 | 2.3883 | 0.99 |
| SNR | 503 | 0.1820 | 1.7182 | 0.99 |
| OAR | 535 | 0.1843 | 1.3425 | 0.98 |
| AAR | 676 | 0.1016 | -0.1257 | 0.56 |
| SER | 958 | 0.2168 | 0.2772 | 0.94 |
| ECR | 441 | 0.0998 | 3.1590 | 0.97 |
| MGR | 568 | 0.0636 | 1.4810 | 0.94 |