| Sketch competence | Sketch competence | Sketch competence | Sketch competence | |||
| Group | The experimental group | The controlled group | The experimental group | Group | The experimental group | The controlled group |
| Number | 30 | 30 | 30 | 30 | 30 | 30 |
| Kendall’s W test | 0.659 | 0.611 | 0.657 | 0.643 | 0.691 | 0.756 |
| Chi-square | 118.628 | 110.004 | 118.275 | 115.701 | 124.336 | 136.114 |
| Degree of freedom | 6 | 6 | 6 | 6 | 6 | 6 |
| Gradual significance | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |