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ANOVA: analysis of variance
| Group | N | Mean | Std. deviation | F-value | P-value |
| First visit | 20 | 97.25 | 1.482 | 1.557 | 0.220 |
| Control group | 20 | 97.70 | 1.418 | ||
| Experimental group | 20 | 98.25 | 2.337 | ||
| Total | 60 | 97.73 | 1.812 |
