| Treatment | Mean | Std. Deviation | Std. Error |
| 1.00 | 1.85a | 0.19 | 0.05 |
| 2.00 | 1.79a | 0.14 | 0.03 |
| 3.00 | 1.91ab | 0.16 | 0.04 |
| 4.00 | 2.02b | 0.26 | 0.07 |
| 5.00 | 2.00b | 0.36 | 0.09 |