| 变量 | IMn | NH3-N | TP | BOD5 | Zn | F− | FC |
| 常数项 | −5.0626 | 0.3388 | 3.4129 | −4.0497 | −0.0245 | 3.7196 | 73904 |
| GDP | 0.0005 | −1E−5 | −0.0002 | 0.0004 | 3E−6 | −0.0002 | 6.2805 |
| GDP2 | −1E−8 | 2E−10 | 4E−9 | −1E−8 | −9E−11 | 4E−09 | −0.0002 |
| GDP3 | 9E−14 | −6E−16 | −2E−14 | 8E−14 | 8E−16 | −3E−14 | 1E−9 |