| Variables | t | df | Sig. | Effect size (dz) |
| Test | 0.226 | 25 | 0.769 | 0.117 |
| Retest | 3.507* | 25 | 0.002 | 1.374+ |
| Delta-percentage | 3.794* | 25 | 0.001 | 1.528+ |