| Factor | least squares means | Level significance |
| Parity | 5296434.17 | * |
| HYS | 119079.05 | * |
| DIM | 2160141.56 | * |
| DIM2 | 39052.71 | * |
| Age | 126285.12 | * |
| Interaction between DIM and Parity Interaction between DIM and Age Interaction between Age and Parity Interaction between DIM and HYS Age2 | 93293.14 20452.151 7119.536 8766.369 4068.379 | * NS NS NS NS |