| (Constant) | 1075.355 | 158.739 |
| 6.774 | 0.000 |
| EC | −9.464E−03 | 0.002 | −0.323 | −3.857 | 0.000 |
| 基质PH | −293.480 | 37.771 | −0.880 | −7.770 | 0.000 |
| 盆底PH | 158.563 | 26.164 | 0.752 | 6.060 | 0.000 |