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VPT: Venham Picture test
| Group | N | Mean | Std. deviation | Chi-square value | P-value |
| First visit | 20 | 1.60 | 1.635 | 0.381 | 0.826 |
| Control group | 20 | 1.70 | 2.155 | ||
| Experimental group | 20 | 1.35 | 1.694 | ||
| Total | 60 | 1.55 | 1.817 |
