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Comparison of mean gingival index scores between different time intervals in Group 2 using Friedman’s test
| Group | Time | n | Mean±SD | Minimum | Maximum | P |
|---|---|---|---|---|---|---|
| Group 2 | Before | 30 | 0.58±0.16 | 0.3 | 0.8 | <0.001* |
| 7 days | 30 | 0.75±0.19 | 0.5 | 1.3 | ||
| 30 days | 30 | 1.07±0.32 | 0.8 | 1.8 | ||
| 6 months | 30 | 1.13±0.31 | 0.8 | 1.8 |
*Statistically significant at P<0.05. Group 2 – Nonfluoridated; SD – Standard deviation; n – Number of subjects; P – Probability value
