| Compounds | Slop (a)1 | Intercept (b)2 | Regression coefficient (R2) |
| E2 | −3.91E−08 | 1.20E−07 | 0.5530 |
| EE2 | −4.43E−08 | 1.12E−07 | 0.5735 |
| BPA | −9.18E−05 | 4.07E−04 | 0.9264 |
| NP | −1.37E−05 | 4.22E−05 | 0.8425 |