| Source of variation | Between groups | Within groups | Total |
| SS | 1569.6 | 1603.8 | 3173.4 |
| df | 2 | 75 | 77 |
| MS | 784.8 | 21.4 | |
| F | 36.7 | ||
| P-value | 7.69 × 10−12 | ||
| Fcrit | 3.11 |