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Intercomparison of plaque scores for the control group between the three visits
| Control group | Plaque index at 1st visit | Plaque index at 2nd visit | Plaque index at 3rd visit | |||
|---|---|---|---|---|---|---|
| Plaque index at 1st visit | Frequency | Percent | Frequency | Percent | Frequency | Percent |
| Good | 253 | 63.3 | 316 | 79.0 | 364 | 91.0 |
| Fair | 146 | 36.5 | 84 | 21.0 | 36 | 9.0 |
| Poor | 1 | 0.3 | 0 | 0.0 | 0 | 0.0 |
| χ2 value = 7.485, p value = 0.006* | ||||||
Chi-square test
Significant difference
